Help identifying old Swiss radiator valve (late 70s/early 80s) for Homematic IP adapter


Hi everyone, I'm modernizing the heating controls in my Swiss home (built around 1980) with Homematic IP (`HmIP-eTRV-C-2`), which uses an M30x1.5 thread.

While most of my radiators work with the included adapters, I have a few older valves left over from before a heat pump upgrade that I can't seem to identify. I tried a 3D-printed Danfoss RAVL-to-M30 adapter, but it doesn't fit, so it's definitely not RAVL (and likely not RAV either).

Can anyone identify this specific valve brand/model from the pictures and point me toward the correct adapter to get an M30 thread on it?

* **Era:** Late 1970s / Early 1980s, Switzerland.