Hello Fert,
-First, looks like a Czech 47cm Vz36 with HO fuze (Az34 (t))
-Second, same idea, Czech or Yugo round.
Regards
Hello,
I have to say that this area is not really my field of expertise.
Jeffs pics prove to me more than often the lack of information I have on our own ammunition.
It could be that most of the information was taken to the US by Jeffs predecessors
The round in question probably is 15cm polopancřov grant (semi armor piercing - Halbpanzergranate) for heavy howitzer (factory designation K2)
Bob