Got an email from Peter aka “Aelgmule”, Sweden, Quote:

“You may not be interested but perhaps the owner of the Bargholz rifle over at the NE-forum is. My e-mail is not accepted on that forum. Apparently, I am not a real person and consequently I cannot register.
Here is what I have on C/Karl Bargholz, Harburg.
C/Karl Bargholz, gunsmith, started his business in either 1877 or 1878. If I had to put money on what year he began I would go for 1877, but I might lose my money. Address for the shop was Bergstraße 11, Harburg. C/Karl Bargholz is listed as both mechanic and gunsmith. He stayed at Bergstraße 11 up until sometime between 1928 and 1932. Sometime in that period the address changed to Bergstraße 31, Harburg.
In 1932 both C/Karl and Hans Bargholz are listed as master gunsmiths. Address Bergstraße 31, Harburg. Both C/Karl and Hans had Bergstraße 31 as their abode, so I assume Hans was C/Karl’s son. Their business is listed as gun and ammunition store. Phone: 37 21 12.
When C/Karl Bargholz left the business (passed?) is not known to me. By 1938 Hans Bargholz is sole owner and it seems he changed the name of the business to Hans Bargholz, Waffen- und Munitionshandlungen, Bergstraße 31. Phone: 37 38 35. When the address changed to Schwarzenbergstraße 31 I do not know. However, I note that the number is still 31, so perhaps the street name was changed from Bergstraße to Schwarzenbergstraße, but, I would like to stress that is speculation on my part. For how long Hans Bargholz ran the shop at Schwarzenbergstraße 31 is not known to me. By 1955 there is a gunsmith Richard Roder at Schwarzenbergstraße 31, Hamburg/Harberg but the business Hans Bargholz, gun shop, is still listed at the address. I again speculate but perhaps 1955 was the year when the business changed owner. By 1962 Richard Roder is no longer in Hamburg/Harburg.
The above is all I have (for now!) on the Bargholz business in Harburg.
Kind regards
Peter“