Help identifying a Speedmaster case

Here's a website for vintage cases, but I couldn't verify yours from your pics. Your crown looks modern too:

https://www.chronoholic.com/post/the-omega-speedmaster-professional-a-case-study

In addition to the case profile, compare your pushers to others, ie size of caps and are the tubes pressed in or screwed in.

Hopefully this link will be of interest. It's very educational, even if it doesn't answer your immediate questiion.

Since this is your first post, curious about where you're from and your interest in Speedmasters or watches in general.

Welcome.

Nice group, you've got a watch for every occasion. You experience of going through watches to find what you're interested in sounds like a mature collector. Me personally, I am still working on that, although I am narrowing it in, finally.

When you get time, you're current case does look like an original Mark 4. A straight on shot of the lugs would expect to be narrower than other cases. Curious to see what the inside of the caseback says. It's a nice looking case, in any case. 😉

Ps, I don't pretend to be an expert. There many other forum members who are the real experts. Just trying to help a wee bit.

Here's my shock.