Most of the 1170 bracelets I’ve seen have a clasp with the Omega logo within a trapezoid or square but this clasp has neither. The links certainly look typical for an 1170. Apparently there’s a rare version where the logo is not enclosed by a trapezoid or square but unsure if this is one of those. Sorry for the poor quality photos.
One for sale on chronocentric that looks the same. http://chronocentric.com/forums/chronotrader/index.cgi?md=read;id=55586
That’s reassuring. This design was not depicted in the attached post so if indeed authentic then apparently there are at least 4 different versions of 1170: https://omegaforums.net/threads/fro...ge-seamaster-and-speedmaster-bracelets.45883/