You can find some information on the 84mm knives on the internet. Some years ago I received information from Victorinox also.
Usually these knives
can be difficult to date and it can be difficult to find the correct name for them.
Many collectors use the numbers for identification usually. The names Popular and Secretary can be found on the
internet. With the 84mm ribbed red alox knives I have found that they usually follow the Pioneer Range stampings and this can be helpful to know. The shim/spacer and key ring are made of Brass before 1986. The secretary with Victoria & crossbow stamp on
the backside of the main blade was made 1968-1974. I am not sure if older blades could have been used further but the information on the Secretary from Victorinox say 1968-1974.
I have found that
Victorinox has used different holders made of an imitation material and more.
It seems both the Secretary and popular can be found with different holders in history. 1957 ia s magic date for the
alox knives by Victorinox but for the Pioneer Range. On the picture are knives from the 1960s-early 1980s in random order. If you have any questions just let me know!