Thanks for responding Pete, Curtis and Morten.
I have found another reference for 9x57 wrt Norma.
Evidently, a July 1949 advertisement in the American Rifleman (Ref Vidar Andresen) from Ashton lists Norma “Custom Ammunition” in 6.5x57, 7x57, 7x64 and 9x57.
Norma Custom Ammunition is known for other calibers also:
-There is an Ashton pkt for “6.5x57R” ( see: 6-5-carcano-norma-box) with the label “norma custom ammunition”. However these contained 8x57JR cases resized to 6.5x57R.
The fact that these are listed as “NORMA CUSTOM AMMUNITION” seems to imply Norma manufacture. I think it is likely that Norma produced limited runs of the above calibers using whatever cases were most appropriate. Norma only produced 8 sporting rifle cartridges in 1948. So if sales went well they would add this caliber to their range, eg:
6.5mm Japanese added 1952
7x57 added in 1952
6.5mm Italian added 1965
7x64 not added until 1974
6.5x57, 6.5x57R and 9x57 were not added to the range.
So I suspect that maybe some 9x57 were produced from Norma 8mm Mauser cases - being produced by Norma from 1947.
This would explain the contents of the Fournier box 9x57 which is in the same time span c1950. 9x57 are known produced from 8mm Mauser case from Genschow & Polte but I think using Norma 8mm cases is much more likely.