Sorry that it took me so long to reply.
1. Well, in regard of the Rostock tally: this is a bit of an odd one as we might assume that Rostock had a fairly strong presence of Naval youth. However, the photos are pretty rare and also no tally is kicking about in any collection as far as I'm aware.
Also, the first word is a bit of a question mark to me for the following reason: Rostock is and always had been a "Hansestadt". However, the word Hansestadt seems not to have found its way on any cap tallies. In the example of Wismar the inscription was "M.H.J. SEESTADT WISMAR". So, by comparing the length of the words "Hansestadt" vs "Seestadt" my guess is that this is also the case with Rostock because the "t" being situated roughly at the front of the cap, the left section must be equally long to the visible "- Rostock 5/90". Below a snip of another postcard I have, unfortunately not giving a good hint on the first word either.
You don't have permission to view attachments.
You don't have permission to view attachments.
2. I can't be of great help here either - the only photo of a 1st pattern Varel below here - with the further designation "i.O." (in Oldenburg). I only have a "6/59 Varel 6/59" tally, unfortunately no photo of this tally available right now.
You don't have permission to view attachments.
Rgds and have a great weekend
Daniel