The Miyota caliber 2105 is a 0 jewel quartz movement. This caliber is made in Japan.
Some of the topics covered in this caliber listing:
Miyota 2105 Variations
Although this is a low cost quartz movement, there are at least 9 configurations available from Miyota. Only two are readily available for order:
2105-20A – English/Spanish day-date at 3:00, black text on white background
2105-2AQ – English/Chinese day-date at 3:00, black text on white background
All of the others are special order only. Typical minimum order quantity (MOQ) being 1,000 pieces, with a lead time of 2 months.
2105-2PKA – English/Arabic day-date at 3:00, white text on black background
2105-2AE – English/German day-date at 3:00, black text on white background
2105-2AK – English/Arabic day-date at 3:00, black text on white background
2105-2AN – English/Japanese day at 3:00, date at 6:00, black text on white background
2105-2RA – English/Spanish day-date at 3:00, black text on white background
2105-20Q – English Spanish day-date at 6:00 (vertical stack), black text on white background
2105-2QA – English panoramic day at 12:00, date at 6:00, black text on white background
Miyota 2105 VS 2115
There is also a similar caliber 2115, with the main difference being that the 2105 shown here has a day-date, the 2115 only has a date. There is also a high hand verion (caliber 2117) for watches with deep dish dials and thick cases.
Miyota states the accuracy of this movement to be +/-20 seconds/month.
The caliber 2105 takes an SR626SW watch battery. The battery is said to last up to 3 years. There is a battery saving (aka hacking) mode by pulling out the stem into time setting mode (position II). When doing this, the seconds hand will stop and the power consumption will be limited.
Changing the Battery
Below is a quick guide to performing a DIY battery change on your 2105 powered watch. It’s easy enough. If it is your first time changing a battery on a Miyota quartz movement, just take your time. The arm with the hole in it is what holds the battery in. It moves slightly to release the battery. When installed a new cell, hold the arm out of the way and simply wedge the new battery under the tab on the left, press down on the battery and bring the arm back over. The arm has a spring-like resistance and should return to place on its own, as long as the battery is in place and not blocking it. Try not to slip the tool and scratch the coil.
With this battery removed, it looks like this:
At the time of this post the replacement price is around $10.95.
Examples of watches with this movement
The movement pictured below was found in an Armitron Durasteel All Aport model 20/1169.