I've been looking all over, in this forum and elsewhere, for scans of Soviet-era watch catalogs. I know I've seen them before, but my searches came up empty.
This evening, I found a treasure trove of them in an Italian watch forum. I'm sure this collection is known to many forum regulars, but I figured I'd post the link here for those who may be unaware.
Here's the link to the original forum post in Italian, and here's the Google Translate English version.
Among the catalogs linked from that post, I found the Amphibia I'm wearing this evening.