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Seiko Caliber 7t62

Seiko Caliber 7T62

Seiko Caliber 7t62

ManufacturerSeiko
Caliber Number7T62 / 7T62A
TypeQuartz
Diameter12”’ (24.1mm x 27.6mm)
Thickness
3.3mm
Jewels
0
Battery Cell Number395/399 (SR927W)
Quartz TypeTuning fork type quartz crystal
Frequency
32,768 Hz (cycles per second)
Driving System
4 part step motor
Stem351580 (tap 10 )
Hacking Seconds?
Yes
Hand Sizes1.10mm / 0.65mm / 0.20mm for chrono and subdials
FunctionsHours, minutes, small seconds, central chronograph seconds, split time, 60 minute counter, date, alarm
Country of ManufactureJapan
Known Models Seiko Velatura (add more in the comments below)

This Seiko caliber 7T62 (actually marked 7T62A) was found in a Velatura model watch here. This quartz movement was made in Japan and features an alarm and chronograph. It is a 0 jewels movement. The caseback has a Piezo attached for the alarm tone (part 4589 801).

7T62 vs YM62

You may also see a similar caliber known as the Hattori or SII YM62. The YM62 is basically the same movement as the 7T62 except that it is sold to other watch companies and used in non-Seiko branded timepieces. Learn more about Hattori/SII/TMI/Epson here. It may be possible to interchange these movements, but the height is slightly taller than the 7T62 (see here).

7T62 vs 7T92

The caliber 7T92 is another popular Seiko quartz chronograph movement. These two calibers are sometimes mixed up. The big difference is that the 7T62 listed here has an alarm and a 1/5 second chronograph that measures up to 60 minutes. The 7T92 has a 1/20 second chronograph that measures up to 12 hours. The 7T92 does not have an alarm.

7T62 vs 7T32

You may see other collectors refer to the caliber 7T62 as an evolution of the original 7T32 quartz movement, however, keep in mind that one huge difference between the two movements is that after replacing the battery, the 7T32 required performing an AC (or all clear) reset by using a wire, tweezers, or a paperclip to touch the positive side of the installed battery with the AC contact (there will be a hole labeled “AC” with an arrow). The caliber 7T62 does not have an AC button or hole.

Chronograph Function

The chrono hand on the 7T62 pulsates 5 times per second. This also allows this movement to measure 1/5 of a second when using the chronograph feature. To reset the central chronograph hand: pull the crown to position 2 and hold the bottom chrono pusher until the hand is at 12:00. Long pressing will make the hand advance faster.

Alarm / Second Time Zone

The 7T62 has an alarm function that doubles as a second time zone subdial. The alarm can be set to ring once in the next 12 hours. To set the alarm, pull the crown to position 1 then press the bottom pusher to advance the alarm time. when you get the time you want, push the crown back in.

Accuracy

Seiko claims that the caliber 7T62 will maintain accuracy of +/- 15 seconds per month at normal operating temperatures of about 41F to 95F. The alarm is accurate to +/- 1 minute.

Replacement Price

Replacement prices of this watch movement were found online in the range of $65.95 – $71.99.

Battery Change

In the manual, Seiko claims that the battery should last approximately 3 years. Keep in mind that the battery will drain faster if you leave the chronograph second hand running – specifically if the chrono is used for more than 2 hours per day or if the alarm rings more than 20 seconds per day. There is also a low battery indicator which will cause the small second hand to jump every 2 seconds. Low battery mode also prohibits the alarm from sounding off. The time on your watch will maintain accuracy even in low battery mode.

The original battery in the watch was also made in Japan by Seiko. The size is SR927W which should convert to a 395 or 399 cell.

Resetting the Chronograph Hand to Zero

There are two hands related to the chronograph function: The central 1/5 second hand and the stopwatch minute hand subdial. To reset the chronograph hands to 12:00 or zero on the dial, first pull the crown out to position 2 (2 clicks to time-setting mode). Hold the top chronograph button for about 2 seconds until the stopwatch minute hand turns in a full circle. Now use the bottom chrono button to advance the hand where you want it (holding the button will make the hand advance faster). Press the top chrono button again to switch to adjusting the big central seconds hand. Press the bottom chrono button to advance the hand to where you want it. Push the crown back in.

More watches with this movement:

Please share your experience with the caliber 7T62 in the comments below…

What do you think about Seiko Caliber 7T62? Keep comments respectful and follow our community guidelines.
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Sam G
Sam G
1 year ago

Online, this movement seems to generally be regarded as very reliable. The only issues I have come accross with it are as follows: 1: Chronograph not responding to *any* input from pushers after battery change (often running until it times out). Potential causes (My believed cause): Watch sat with leaky battery and corroded/oxidized the B (lower) pusher contacts. While actuating presser B, watch the lever that moves within the recessed area for the battery. Use… Read more »

CeeLo Green
CeeLo Green
11 months ago
Reply to  Sam G

Tip: I’ve used V371 (for a short-time period) – V395 and V399 (for the normal time period) batteries. They áll worked just fine in this 7T62 movement !!!

trackback
S. Epson Corp. Caliber YM62A Watch Movement | CaliberCorner.com
1 year ago

[…] caliber YM62 is based on the Seiko caliber 7T62. It is found in non-Seiko branded watches. It may be a possible replacement for the 7T62, however, […]

JJ
JJ
1 year ago

In the battery compartment of the 7t62A what is the Orange tab and its purpose. In my seiko that Orange tab has turned to dust exposing a small circuit. Should that have contact with the battery or with the gold like prongs the connect to the battery? or should that circuit be insulated from both prongs and battery. Even after a battery change my trusty Seiko is not working because that orange tab disintegrated when… Read more »

Watchgeek
Watchgeek
1 year ago
Reply to  JJ

Are you talking about the translucent brown thing? It’s called an insulator. If yours turned to dust then it’s likely that it crystallized and disintegrated due to an old leaking battery. I hope someone corrects me if I’m wrong but I think they use them in these quartz movements to protect against improperly touching part of the movement that could cause it to short circuit. Based on the pic with the tweezers, it looks like… Read more »

trackback
Seiko Caliber 7T92 Watch Movement | CaliberCorner.com
1 year ago

[…] caliber 7T62 is another popular Seiko quartz chronograph movement. These two calibers are sometimes mixed up […]

Karl Napp
Karl Napp
11 months ago

This movement is also used in the Seiko Flightmaster SND411.

Chickenchop4lyfe
Chickenchop4lyfe
8 months ago
Reply to  Karl Napp

This one Btw it’s SNA411, not SND

Jones Foyer
Jones Foyer
4 months ago

This movement is also in the SBDP021 Seiko Speedmaster, with a production of only 600 watches. Interestingly, the movement is used in the bullhead orientation with crown at the top and the date is not exposed (but likely present) under the face of the watch.

D Midgley
D Midgley
3 months ago

This is used in SNAA30 nitrided titanium chronograph, very good battery is now 4 year old and still working well, plus a classy looking watch and now not on sale

Carlos
Carlos
2 months ago

What does 0 jewels mean?

MND2955
MND2955
1 month ago
Reply to  Carlos

It means it has zero jewels.

trackback
Seiko SNA411 “Flighmaster” – SaFonaGastroCrono
2 months ago

[…] SNA411 porta el calibre 7T62, un derivado del 7T34, pero con dos pulsadores menos. Como suele ser habitual, es fácil encontrar […]

Mariano
Mariano
1 month ago

Can this calibre work properly with a sr920sw Sony battery? Thanks.

MND2955
MND2955
1 month ago
Reply to  Mariano

It’s always better to use the correct battery, but I this in reverse for a TAG Heuer watch once. It called for a 371/SR920SW but I put in a 395 SR297SW to get more battery life out of it. No issues and perfect timekeeping. I haven’t tried a SR920SW battery in my Seiko watch, but comparing the two batteries it is close to being the same as the SR927SW, except the SR920SW is slightly thinner… Read more »

Sal
Sal
1 month ago

Looking for a Y185b movement Epson, Thanks in advance

Sal
Sal
1 month ago

Looking for an Epson Y185b movement, thanks in advance.

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