If that's a legit steel case Futurematic, that price is extremely cheap, even with the bad redial. Very hard to fake these watches, as almost every part was custom made for it. Should be a Cal. 497, not a 481. I'll give the seller half credit as the 481 was JLC's "other" power reserve indicator caliber. Hope this helps, gatorcpa
Good grief I never realized these were so valuable! With the bad redial, absence of movement shots and poor photos in the listing, I wasn't really paying attention to the watch and just chuckling over the auto-corrected title. BTW, I had thought the 37mm ones came with the porthole power reserve, but looks like they came with the 'usual' ones too.
The major difference between the Porthole and Twin Dials is the movement, cal 817 vs. 497. Even that switch is only a few parts: Cases are interchangeable as are the dials. Although you wouldn't want to. gatorcpa