This 70’s creation looks close to unused and I doubt it’s ever been opened before. This is a late 70’s diving chronograph with a depth meter built in the crystal. This works where there is a red marker inside a tube in the crystal, the opening of this tube is blocked by the water, and the air inside is trapped. When you dive deeper the air in the tube compresses and the water comes in pushing the red marker indicating the depth on the bezel. This is a Longines product, but I suspect some cheeky dealer in the 70’s had some made and sold in France.

Next day I finally get to see the movement. Valjoux 7733 is a great workhorse and this movement has never been touched since it was first put into the case. They went to the length of marking the bridge Longines.

I start taking the movement apart. Even though it looks clean there are small particles of dried oil and grease.
2 Responses to 70’s Deptmeter chronograph calibre: Valjoux 7733
I love this watch. Lucky find!
Regards
Ray
if I may, what glue did you use?
p.s. the rest of us sinners, we use oils 🙂