Help with Ed White Speedmaster repair 105.003 1967

Hi

I'm new to the forum and could do with some advice.

I have a 1967 Speedmaster 105.003. The crown and stem have recently become detached from the watch movement, (see photos).

My question is if this is a simple repair that could be done locally be a decent watchmaker ... or is this something that is best left to Speedmaster/Omega/321 specialists? The watch was my Dad's so has huge sentimental value. I don't want to skimp on the repair but would rather not be sending it away for months on end if I don't need to.

The watch had a full service by Simon Freese (UK) in June 2021.

Thanks in advance for your help.

Mike

i (also i am no watchmaker) think, what "140dave" wrote is correct - if the screw (angle screw) was loosend
(and that should be the reason) it is possible, that the angle spring lever is/will be shifted by for example
pressing the crown in, but

every watchmaker can try to fix the screw, so that the winding stem is fixed and in a few minutes
everything will be ok (with a bid of luck)

otherwise (if the spring lever is shifted) for reason, that it is a chrono-movement, there will be necessary
a partial movement dismantling and that should do someone who knows what to do

Set screw loose…set screw broken…setting lever damaged. In any of those instances, it’s an easy fix for a competent watchmaker.