someting id like to share

[Jonathan M]

recently added a large lot of feldpost letters to my collection and one of the them came with the following inside the envelope. its obviously some kind of post card but other than that i had no prior knowledge of their existence. can anybody contirbute any more information please? im trying to figure out which unit the FN on the envelope is from, and theres a stamp on the reverse of the postcard that dates it to 20.10.42 or 43 (the last two digits are a bit faint

thanks in advance
Jonathan

[ramon]

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[Jonathan M]

what does the german script under the IAB say? as regards the FN the best i can make out, its written in the same light coloured pencil as the postcard, is 11433 or 11455

thanks

jonathan