As to the .41 Swiss rimfire, it was loaded by the Swiss Government at least until 1900, by commercial firms in North America until shortly before the US got involved in the Second World War. There has been none loaded since 1941.
Swiss Government ammo has the Swiss cross on the base.
D indicates Dominion Cartridge Company, Canada: made until War Two.
U is Remington-Union Metallic Cartridge Company: last manufacturer.
US is United States Cartridge Company: generally pre-1920.
H is Winchester Repeating Arms.
That takes in most of them. Cartridges with no headstamp do exist. I have no idea who to blame them on. Individual cartridges seem to run about $8 to $12 at gun shows so, if you have located 10,000 of these, you are away to the races.
NOW you are looking for the Vetterli repeater to go with the Swiss round.
.