More authentic?
It depends how you define it.
These so-called “submarine “ clocks like that one on eBay were sold by the thousands by catalog mail order venders in the USA and I presume in other countries back in the 1990’s.
The Russians were emptying their stockpiles of USSR items.
I paid about $59 USD for one back then. I still have it complete with wall mounting bracket. Their weakness is that the platform escapement was rather fragile. New platforms were available until recently.
Aside from maritime interests, I collect and repair antique clocks.
73,
Doug/WA1TUT
ex ROU Radio Electronics Officer