Bought a Watchco Seamaster 300 because I want to wear it. I also have on it, at the moment, a nice 1610 bracelet with 840 endpieces that fits well and looks nice.

I would also like to wear a rubber deployant strap that fits to the case.

Some reading online suggests that straps for the 42mm Planet Ocean also fit the Speedmaster, and the case for the Seamaster 300 is close to, but not the same as, the modern Speedmaster.

My question is, have any of you tried either Seamaster or Planet Ocean fitted straps, such as can be bought from Otto Frei? If so, how well have they fit?

Thanks

Tom