Alan72

Thanks everyone. Matt has the watch and hopefully if anyone can sort out the crystal deal it would be him.
Alan your builds are really, really nice. Nice probably being and understatement !!
Nanug, if you remember years back I had an aqualung BP. That was sold to me by a watch shop here in the USA as a genuine. It had the thinner case like Alan’s Vietnam cases. Stupid me, I sold it mainly because most of the replicas had thicker cases and I thought the thinner case was incorrect. Boy was I wrong. . I never opened the back, but I would bet it had an AS movement.


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This is the kind of thing,the old skin diver type of plexi.
Really the dsn rehaut with the gasket is designed for a sapphire crystal but I used one of these in one of my dsn builds and it was pretty water tight , my Vietnam blancpain builds have the diver tite crystal and even without having a screw down crown they are water tight

Just measure the crystal and then get a tension ring crystal from cousins, get the same size as the dsn plexi to fit inside the gasket, the tension ring makes for a tighter fit, in an ideal world you would fit the tension ring crystal without the gasket but if you do that the extra size will mean that when you turn the bezel you will turn the crystal 

https://www.cousinsuk.com/product/divers-chrome-ringed-glass-atct