Hi, this isn't a military watch per se, but a "military-like" watch.

I would say spend your service money on a watch that has a higher value than this one as you'd be underwater if you ever decided to sell it.

It's the same family.

Next one that comes in for repair, I will note what our shop used for the crystal.

How do you know it's an original crystal is more my question. In my opinion, there is no way to tell, so best not to worry about it. If it clears the hands you are likely to have the right crystal profile anyway.

How do you know that is the correct dome height?

Looks like a Swiss-made Longines case.

The majority of the chronos are made by Universal Geneve and a few by Valjoux. They are not JLC brand-specific.

The caliber P478 or any of the caliber 450 based family is quite nice too and can be found at a much lower price point than the Geo and Mk 11.

Zaf

I'm pretty sure it's a Longines with a dial that has been refinished as a LeCoultre. Even for LeCoultre at the time, this would be very unusual.

The movement found in the vintage Geopysic (P478/BWSBr) and the Mark 11 (488 Sbr) are probably the best.

Yes with a non-lume model or it has fallen off. On the top example, you can still see signs of the lume. They were either dipped in lume at their tips or had conventionally filled dauphine hands.