Nowadays, Credor are probably best known for producing artisan quality mechanical marvels, such as their exquisite Fugakau, the Spring Drive Sonnerie and Minute Repeater, but the brand's beginnings were rather less auspicious. Here's Credor's history according to parent company Seiko, with a milestones and a few noticeable gaps. The brand originally was created in 1974 as Crête D'or (meaning Gold Crest). Volume production of watches ramped up from 1978, with the first Credor JDM catalogue printed in 1980. They started off manufacturing watches in precious metals, using existing available Seiko quartz movements. It begs the question why they ever entertained producing a Credor version of the humble 7T32, when a solid 18K gold version already existed, in the form of the classic-looking 7T32-6C70 SDW162:
- 7T32-6C70-SDW162-18K-Gold-SCWF-Oct2009.jpg (220.46 KiB) Viewed 26741 times
Reference old forum's Thalassa 7A74 thread intro (for Lassale 7T32 stuff).
In this 1989 advert, Seiko attempted to give the white dialed version of the Lassale-branded 7T32 something of an air of exclusivity:
- Lassale-advert-1989.jpg (78.04 KiB) Viewed 26779 times
Verbiage to be fleshed out later - post still under construction.
There are other parallels that can be drawn with Seiko's Lassale and 'Swiss' branded Jean Lassale operations ....
Remember how the Jean Lassale 7A74A movement turned out to be little more than a mundane Seiko 7A34A movement (albeit one fitted with a differently oriented date wheel) and gold anodized back-plate ? Following the same logic and nomenclature, does that mean that the Credor 7T72B is nothing more than a common-or-garden Seiko 7T32B movement with a gold anodized back-plate ?
See: https://www.watchprosite.com/seiko/intr ... .10073526/ 7T72 Chronograph, date, alarm and NO JEWELS.
- Credor-Seiko-7T72B-Movement.jpg (43.03 KiB) Viewed 26789 times
Edit: I later found this sequence of (9) photos of a 7T72B movement in an ended Yahoo Japan listing:
- Credor-7T72-6A10-YahooJapan-Movement.jpg (242.68 KiB) Viewed 26704 times
There wasn't any doubt in my mind, but here's proof positive that they're from the same family of Seiko movements.
Below is an edit of a screenshot that I'd previously posted somewhere in a thread on the old forum. The familiar tabular format is from the original version of Seiko Oceania's database. It's a reverse look-up (where used) on Seiko p/n 0802580 (the 7Txx plastic date changeover wheel). I hadn't noticed the 7T72B at the bottom of the results returned before. 
- SeikoOz-WhereUsed-pn-0802580-7T72B.png (37.23 KiB) Viewed 26777 times
Indeed, here are perfect examples of two such extremes:
