Credor Caliber 7R31

Brand	Credor (Seiko Watch Corporation)
Caliber Number	7R31, 7R31A
In-House?	Yes
Movement Type	Spring Drive, manual-wind
Diameter	Unconfirmed
Height	Unconfirmed
Jewel Count	30
Frequency	32,768 Hz
Claimed Accuracy	Within 15 sec/month (1 sec/day)
Power Reserve	72 hours (3 days)
Integrated Circuit	C-MOS-IC: Oscillator, Frequency Divider, Spring Drive Control Circuit
Anti-Shock Device	Diashock
Hand Count	4 (3 on front, 1 on back)
Functions	Central hours; central minutes; central sweeping seconds; power reserve indicator on the back
Hacking Seconds?	Yes
Country of Manufacture	Made in Japan
Known Models	Credor Kuon (ref: GCLX997, GCLX999) (Add your watch to the comments below…)

The Credor caliber 7R31 (7R31A) is a manual-wind Spring Drive movement found in Credor Kuon watches only available in the Japanese market.

Watches with this movement were introduced on September 29, 2023.

Credor 7R31 VS Grand Seiko 9R31:

The calibre 7R31 appears to be the Credor version of the Grand Seiko caliber 9R31. Both movements share the same specs and are both produced by Seiko. Cosmetically, differences can be seen in the finishing, branding (obviously), font, and the design around the power reserve indicator.

Editor’s Humble Opinion: There are cool design elements in both movements that would make for an awesome caliber if they were combined. See the quick artistic rendition concept movement below as an example:

Timepieces with this caliber:

Additional Resources:

• Official instructions guide
• Seiko press-release 9/29/23 (Japanese)