They look like 310 dies. They are still made and Lyman provided them in 41 Mag and also 41 Colt.
I'd guess yours are for the 41 S&W Magnum cartridge.
I did see one set that was marked '41 Colt Long' quite a while ago.

41Mag is a .410 bullet,,,,,,41Colt is a .400

Do a search for 'The 310 Shop' They are in Texas I think. They still make alot of 310 dies and tools. Alot of obsolete cal dies and at one time I believe they actually made the dies that Lyman retailed.

It would be neat though if they were some special production dies for a .41 S&W Special cartridge..