My family and I went on a few day camping trip, so I took my 5600C.
This is the vintage screw back from the late 80ies as you know,
and that one went through a case back gasket replacement, Silicon
lube to all pushers gaskets followed by a pressure test, before the trip.
I even jumped heads on from about 3.5m height into the mountain cold water,
getting a 3m deep underwater, after the jump. The 5600 had no complains