UBB.threads Forums Edged Weapons Hunting, Forestry, and Shooting Forum F Dula with a twist

It's taken me some while to go through all my period advertising to find this but it proves that these things were sold with and without skiing knives.
The first picture is from a period hunting magazine(Deutsche Jagd) from May 1936, I believe this is prior to the date of the patent but does show that these knives were produced earlier on in 1936. It also does not have the DRGM stated as does the 2nd advert which would make sense prior to the patent.
The second picture is from the same hunting magazines but dated December 1938, it clearly shows a different advert and has an option to sell without the small knife.
I do wonder in the first advert the meaning of the (2 31*), would that possibly mean that you could get a discount down to RM31 if you bought two of these????

Gary