Trying to identify RF connector, similar to UHF, but different thread pitch

[AndrejaKo]

So I'm trying to identify some mysterious RF connectors. At first glance, they seem like regular UHF connectors, bun when looked in detail, they aren't.
The dimensions are basically the same, but the thread pitch of UHF is different, so a UHF connector can be screwed on only around one turn onto these connectors. It appears that these connectors have a 1.25 mm thread pitch.
They have center conductor pin which has two small "wings" which spread out spirally from the pin, and the "wings" seem to act like springs.
Center pins are marked with Z which has a circle in its middle, Bte SG DG
The little triangular elements are smaller than on regular UHF connectors.
The bodies seem to have dark blue/black finish and have shiny metal underneath the finish. There's also a characteristic symbol painted in white paint onto the connector bodies.

[Andy Watson]

A metric version of the PL259 ?
Apparently, PL259/SO239 are available in metric and imperial versions. The imperial has a thread of 24 tpi.

[A.Z.]

see if this can help

https://messi.it/en/catalogue/rf-coax-connectors.htm