@Mart
Even more interesting
"...presumably...."? What you wrote was only :
Mart wrote: ↑Wed Mar 20, 2024 12:50 pm
"НВ", Hermann Bank.
A rather absolute statement.
Yes, masters could have used several different punches for several reasons.
Anyway, I cannot find anything indicating that this conjoined mark (HB or HK mark) would have any connection to Hermann Bank. Of course it is possible, but how to verify it? As I already mentioned Bank used also a not conjoined HB mark.
Mind my asking but what "same book" are you referring to? Unfortunately this Erich Bank is unfamiliar to me. In addition, his mark would most likely have been EB hardly HB, or? Kindly tell me more about him, thank you.
Last but not least. I wouldn't draw hasty conclusions on deficient information. I still consider the shown mark to belong to an unknown master. But yes, it could be Hermann Bank but with reservations.