NO. It's only a nice "Souvenir Card". Why ? Because as per FIP Rules a maximum card must coply with three conditions : concordance of (1) Subject, (2) Place, and (3) Time.
Whilst no. 1 & 3 conditions are met , the no.2 condition NOT ! Because in Berlin there was not ( and there is not) a PORT where a navy submarine can call at !
So what we have here is only a nice "Souvenir Card " and not a Maximum Card !