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A very good article on Speedmaster bezels

 

... has been published on Timezone-Italy.  It is in italian, but it is based on observatons by a few of the best Speedmaster people around, Gino Balbi and others

forum.timezoneitalia.com

In teh same site tehre is also a nice one on the push-buttons of Sppedmasters.

Regarding the crowns, what I know is that the second one you mention is the one used in all 2998s, and has a diameter of 6.7mm.

The third one I had never seen before, the first one is of later production.

Best wishes
Franco

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