UPDATE
I've expanded the Seapearl 600 collection a bit.
Two fancy-lug Seapearls have been added to the fleet. Both of these have "Seapearl 600" in silver lettering within a black rectangle. The one in the middle of the top row has an EPSA case dated 9-57. It needs a service... runs but doesn't set. On the watch at top left, "Sherpas" is added above "Seapearl 600." That one has had a little polish on the backside but is otherwise in good shape.
So at least four variants of these early divers.
The backs demonstrate varying levels of abuse... and what a nylon strap can do to stainless steel:
Click to expand...