Oris Caliber 733 (733-1)

The Oris caliber 733 is an automatic movement with 26 jewels and a frequency of 4 Hz (28,800 beats per hour).

In the brand’s own words:

“Centre hands for hours, minutes and seconds, date window, instantaneous date, date corrector, fine timing device and stop-second.” –Source

Base Caliber:

Oris 733 is basically a Sellita caliber SW200-1 with a custom rotor.

The rotor features a red upper piece with the following text: “SWISS MADE / ORIS / HIGH MECH”.

What grade is it?

Oris is transparent about using the standard grade for the 733 (source).

Typically, the standard grade Sw200-1 has a Novodiac anti-shock device, however, it appears that Oris orders the base movements for the 733 with Incabloc chock absorbers.

Learn more: All About Sellita grades

Accuracy:

According to Oris, watches with the 733 can expect timekeeping to be within +7 to -12 seconds per day – resulting in an average accuracy of -5 to +19 seconds (source).

Oris 733 VS 733-1:

At the time of this post, the Oris catalog features watches with both the cal. 733 and 733-1.

Both are based on the SW200-1, both have the same dimensions (25.6mm) and jewel count (26). The main difference is the power reserve quoted by Oris:

• 733 – 38 hours
• 733-1 – 41 hours

Caliber Corner has reached out to Oris for more information about these two calibers and will update this post accordingly.

Update 12/30/24: As suspected, the “-1” in the 733-1 is there to correspond with Sellita’s move to the updated quote of 41 hours power reserve for the SW200-1.

Examples of watches with this calibre:

The 733/733-1 is used in a wide array of Oris watches.

The movement pictured below was found in an Oris Aquis Date dive watch:

Additional Resources:

• Sellita SW200 Vs. ETA 2824
• Sellita SW200 VS SW200-1
• More Oris mentions