How to (better not ;-) ) remove a Speedmaster caseback...

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A nice looking 105.012-65 for auction right now but look what someone did to the caseback...

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I think there's a "not" missing in the title of your thread...
 
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That is nightmarish. It makes me wonder why they were so desperate to get it open. And if they couldn’t open it properly what they were planning to do once inside. Strange.
 
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Looks like they used circlip pliers and possibly a cold chisel in some spots. There are certainly witness marks wher they filed the burrs off.

One wonders what they thought they could achieve in there especially since they neither had the skills or the tools to get the back off without damaging it…..perhaps they made some fine adjustments with a 4lb hammer and a cold chisel or maybe something gentle like a 9” angle grinder!
They definitely didn’t clean anything….. it’s putrid!
.
 
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“Darn it, Joey! How many times have I told you only to use Pahawi’s case opener on Daddy’s Speedmaster!”

 
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That's a terrible view!
There's a local watchmaker, who mainly does battery changes and works on cheap (sub 1k) watches, and he opens case backs using some old 2-fin opener. Something like this:


The last time I visited him I gave him Bergeon 8008 rubber ball.
 
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The mystic about the "tacce" - the sea-horse stares at - is now solved !.
 
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Presumably the watchcase was clamped in a Black & Decker Workmate
 
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If the watch could speak no doubt it would tell an interesting story!
 
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If the watch could speak no doubt it would tell an interesting story!
I dunno about telling a story, more like screaming in pain!
 
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“Hi I’m Freddy and I’ll be your watchmaker tonight”
 
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I’m relieved no one dropped a Michael J. Fox reference.
 
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I’m relieved no one dropped a Michael J. Fox reference.

You made my day with this one ! Thank you for that !