Good little guide to vintage SM300 types

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I was offered one of these a while back. Very cool piece but I was a little afraid of damaging the bezel, I think it is Bakelite and looks fragile
 
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... I think it is Bakelite and looks fragile

From what I understand, the later service bezels are acrylic and the early bezels are a cellulose mix and have never been bakelite.

They're more fragile when compared to an aluminum bezel, but not as fragile as people think. Cracks in the bezels seem to be formed by strong blows or improperly removing and bending the bezel. As long as you're careful, they're fine to wear. I'm pretty careful with my dress watches that have acrylic crystals (which are must more delicate), and I try to afford the vintage divers a similar level of care.
 
Posts
379
Likes
385
From what I understand, the later service bezels are acrylic and the early bezels are a cellulose mix and have never been bakelite.

They're more fragile when compared to an aluminum bezel, but not as fragile as people think. Cracks in the bezels seem to be formed by strong blows or improperly removing and bending the bezel. As long as you're careful, they're fine to wear. I'm pretty careful with my dress watches that have acrylic crystals (which are must more delicate), and I try to afford the vintage divers a similar level of care.
Sounds right. I will say it’s tough to find a bezel in really good condition, most look fairly beaten up for better or worse