Good to know. Thanks!The one with the black ring on the inside IS gen. It has the open 6 and 9 and they are actually very rare to find for the 3135 because open 6 and 9 was on the 3035 movement so it must have been a very short transition period that they used these for 3135. Its a really nice part to have on hand if you are building an older model Rolex using a 2836 movement because you can use it as an overlay
Just look at the font - so crisp! Definitely gen.