Jaseewasee
275
Early Aquatimer 812
Helping a friend go through some “old watches”. Loving this early 812. The watch runs and both crowns function as they should, but neither of them screws down. Does anyone know if this is correct for the model? Seems that the bottom crown should screw down? 
Vintage
Explore the IWC Aquatimer Deep One, a pioneering mechanical depth gauge watch. Collectors discuss its titanium case, unique complications, and why such specialized tool watches are rare today.
29 replies5408 views
Reference Guide
Explore aWtchslvr's in-depth review of the IWC Aquatimer Automatic Ref. IW328803. Discover its 32111 caliber, SafeDive system, and community insights.
22 replies5789 views
Manufacture
Explore foversta's visit to the IWC Paris boutique, featuring hands-on wristshots and reviews of the Mark XVIII and Chronograph Spitfire from the 2016 Pilot's collection.
10 replies4101 views
Early Aquatimer 812
Helping a friend go through some “old watches”. Loving this early 812. The watch runs and both crowns function as they should, but neither of them screws down. Does anyone know if this is correct for the model? Seems that the bottom crown should screw dow...
its a 200m divers watch
both crowns are designed to be screw down. top one for the bezel-bottom for the time and date the first generation aquatimer 812 -2000 pieces only. if the crowns do not screw down then the threads of the pipe and the crown may be worn out and need replaci...
the super compressor case patented by ervin piquerez (epsa) in1956 till 1975 did have screwdown crowns
modified versions were made by some brands. this model does have them.an easy way to check is to inspect with a loupe to look for the screw threads below the crowns.
Took a closer look.
Got out the loupe and I don’t see any evidence of threads. The top crown doesn’t even pull out. You can turn it freely to adjust the inner bezel. The bottom crown does pull out to adjust the time and date.
see the link article from 2023-that confirms that the 812 has screw in crowns
www.fratellowatches.com
two screwdown crowns
But let’s get back to the watch itself. As I mentioned, the brand chose a 37mm Super Compressor case. It featured the two characteristic crowns embossed with the IWC fish at 2 and 4 o’clock and was water resistant to 200 meters. Most of you will know that...