Speedmaster case difference

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Is there a difference in 145.022 cases or are they later service replacements? The cases I refer to have a thicker brushed side and it drops down by the lugs. I’ve seen this case on many Speedmaster on the sales section here but no mention of it’s a service replacement
 
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Somewhere here there's a thread on the subject. Have you done a site search?
 
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Somewhere here there's a thread on the subject. Have you done a site search?

Did a site search but the key words are often used.
 
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I started a thread on this a few months ago as I was curious and noticed the same thing.
The consensus seemed to be that all vintage 145022 mid cases were the same, more or less.
https://omegaforums.net/threads/145-022-case-differences.73852/
The 60s and 70s cases seem to drop down more.
Thanks for your input. It does appear though that your thread didn't resolve it either. The past few 60's/70's speedmasters here have had different case profiles
 
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There are certainly variations between different 145.022 references. Not just between vintage and modern, but also between different vintage references.
 
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There are certainly variations between different 145.022 references. Not just between vintage and modern, but also between different vintage references.
Thanks