Any T17 Omega's out there?

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A lot of these movements look very similar to the tissot T20. Awesome watches fellas, love the vintage tanks.
 
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Continuing my "posting frenzy" today as I kick off my -active- membership. Including a rather random closeup picture of the movement -- gorgeous, isn't it?

 
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Hi, I was wondering and maybe one of the T17 experts can share some insight:
1. CK921 I have one with a solid bar, and i see this ref without. Ant thoughts about when Omega skipped the fixed lugs?
2. The crystal, i have some with “bubble” glass (real glass) some with the plastic (now a little brownish) “bubble” crystal, and i have some with a thick flat slap crystal on it. I asume the bubble brownish plastic crystal are original. Any nos out there. And or did Omega switch to flat crystals?

Regards!