Dear all !

I want to ask a question concerning the crown, which is described in MWO as B1. 32 - Narrow Ω Angular Feet
(1960s and 70s)
As mentioned there, this crown could be seen on speedmaster models from the 60s, but in none of the standard models shown in MWO this crown is listed as the correct one....are there any explanations about this?

 

From the previous page:

 

.... so these are general seen as service crowns?

 

Yes