OT-oberbauleitung Freistuhl

[Kris]

Hi all,

I have a fieldpost letter from a Flemish OT volunteer in my collection.
He uses the fieldpostnumber 58669A.
This should stand for the OT-oberbauleitung Freistuhl.
Letter is from 26 august 1943.

I can't find any info on the OT-oberbauleitung Freistuhl and i'm looking for more info.

Thanks in advance,
Kris