I found this at our local NAWCC meet, and it was inexpensive so I thought it would be a good item to add to the DB as a Bulova Accessory or tool/test equipment.
Original box and manual. The idea here is to spread the 'Detectaire' along the seams and around the crown, and then put the watch on the rubber pad. The heavy glass dish is then placed on top, and the handle is pulled down to create a partial vacuum.
The air pressure around the watch is suddenly less than it is inside, and if the watch leaks, bubbles will be seen in the 'Detectaire'. (Soap)
There is no mention as to what rating this device tests to, and of course, 'Waterproof' is a term no longer used. If I can find a pressure device I may put it on the pad to see what kind of drop there is. My guess would be 3 ATM., which, by the way, is not even sufficient for surface swimming. For that you need a screw down crown and 100m. You might get away with 50m, but you definitley need the screw down crown. Water tests are done statically, and any motion through the surface or under it creates much larger pressure requirements, so the static test is merely a guide.
There is no date on the device or the instruction manual.