So I was over at watchsmith, a chronograph master, just hanging out and learning about the V72 when he told me to look in a box for spare parts. As I was digging through I saw a lot of broken chronograph movements. A few V23 and even an extremely rare V237. But what caught my eye was an almost complete (well not almost but it's not too far from complete) Valjoux 72. Now we know this is what the vintage Daytonas runs on.
I quickly picked it up when I realize it wasn't a V72 at all! It was a genuine Rolex 727 (Rolex sources their movements from Valjoux and the further modify them into the 727).
My watchsmith says he was shocked he still had some in there. He's been working on chronographs for almost 40 years and at one point had many vintage Daytonas and spare movements. Most of them have been sold or complete for his own personal collection. He thought he sold all his spares but I found one that was left tucked into a box under the spare parts cabinet.
Seeing my enthusiasm he agreed to sell the incomplete movement to me and after some cleaning this is what it looks like!
I'm trying to source the rest of the parts right now. It's gonna be a long process but this is exactly what I need for my Daytona Yatchmaster prototype build!