Help Needed For Pre-Seamaster?

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Greetings....needing expertise on this one. I only have these 2 pics currently. Has anyone seen these with no
Seamaster script but calendar script only? Is it even a Seamaster? Sorry, I’m nowhere close In order to get the case back off to do any investigation.....and being rather inexperienced, I would still need some help!
Thank you for your advice and opinions.
 
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It’s a redial. I’m also confused by the case back as usually these gold capped 2627 references have steel case backs. Wrong crown too. I suspect it’s pieced together.
 
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That caseback suggests local, probably USA manufacture.