Finnish-Made Blanks will be restricted to cases coming from M38 7,35 Carcano Ammunition ONLY. Finland did NOT receive any 6,5 calibre ammo or Rifles from Italy. in 1940-44.
If the dates are outside the 1938-39 & 40 range (Known Production years for 7,35 ammo, by both Italian Gov’t Plants, and SMI and ?BPD,) the Blanks are NOT Finnish. All the Finnish-made Blanks will have one of these three years.
Anything else is an “aftermarket” Movie or Re-enactment/Military training manufacture in the USA etc., using mostly 6,5mm cases; ( it is Possible some 7,35 was also “Pulled down” stateside to make Blanks, just as Czech Vz50 7,62x45 was Pulled down to make Ball and Blank 7,62x39 for US Military training. ( Czech bxn and aym headstamps)./)
With-out a Packet to definitely ID it as Finnish, or the actual use of a 1938,39 or 40 dated case, will partly confirm the Finnish Remanufacture. Otherwise, a 5 cent Blank cartridge by “Bubba”.