KM Feldpost Nr Help Required

[hucks216]

Hello,
I have just received a photo album that belonged to a crew member of a destroyer/torpedo boat. Despite photos of the sailor his name wasn't written anywhere but I have just noticed a postcard addressed to a sailor with the Feldpost Number M 13885 - Dated Oct 1941
Can anyone help identify the unit please.

[Simon O.]

It belonged to the Torpedoboot T-4

[hucks216]

Many thanks Simon. That helps a lot.