Need help authenticating/learning the history of an SM300 165.024

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Hello!
Diving straight in to it - this 165.024 has a cal.550 (understood for the US market) with serial 2712.
I know the bezel is not original (although unsure of the bezel's origins). Would anyone have any information on the dial and whether it matches the movement serial (denotes to potentially '68).
I'm just trying to piece together a better picture of this watch's history. Any help/advice would be greatly appreciated. thank you!

 
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Is this your watch? A watch you are buying?
 
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welcome "wwiseman"

what are your thoughts about the bezel after using
the informations from the link?