The style on the right is also found on 9x19mm ammo. As an opening bid for a discussion, I will offer a GUESS that this dummy dates from the 1950s. The pre-WWII FN 9x19mm loads had serifs on the letters based on dated ammunition and some boxed ammo. Around 1936 the serifs were dropped, the the F N * ammunition from this period (as identified by box labels and by the Green cms) has a “normal” star.
Post-WWII the letters lacked the serifs. The “stick man” style star also appears to be post-WWII since it occurs on ammunition with the pink cms and PA typical of early post-war 9x19mm cartridges.
I offer all this from my decaying gray matter and without access to my collection or records so I am probably wrong in some details, but others will correct my mistakes.
The F N headstamp on the left doesn’t occur, as far as I know, on 9x19mm cartridges so I won’t venture guess when it was made.