which unit can this be ?

[Daarom]

[Daarom]

Maybe RAD ?

[Gwar]

The RAD usually had the RAD Meldeämter 'M' on the tag with the location number of office G

[BlackCat1982]

I'd say it's a Luftwaffe Mobilierungsnummer, but not listed. Likely FJ Lehr unit of some description.