Hi Khayman.
I wouldn't be so sure that the photo shows U99. I think he was sunk in mid-1941. And at that time u-boats surely didn't have the extended flak platforms yet.
One would have to check when U123 was sunk, because I spotted that number on the conning tower. And there is a symbol as well.
The next one posting will have the solution probably.
Cheers
Kai
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