Unknown german fuzes

[genkideskan]

Anybody here knows these fuzes? Could be preset - safe - 2 - 12. Groove for an
gasket and german standart fuze thread M50 x 3. A fine thread for booster or missing mechanical parts? Might be a hydrobarik system for anti sub shells.
No markings and too heavy for aluminum nonmagnetic - maybe zinc alloy.

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[spotter]

RDZ F. 8,6cm time and impact rocket fuze ,used with navy rockets 8,6cm HE Rocket L/4,8 KZ and 8.6cm Raketen abschussgerat M42

 

[genkideskan]

Thanks a lot

any drawings?