With descriptions added to the back of the photograph:
1) in Hanns Weltzel's hand:
Weißkar + Nucki

2) in likely to be Klara Weltzel's hand:
Sohn v. Max?


Depicted in this photograph are:
Otto Schmidt (left); Paul Ansin (right)

Please refer to the table in GLS Add. GA 3 for additional details on these individuals, along with alternative names and spellings with which they may be identified.