Depends on what type of 32 ammunition you are referring to.
Browning made the "Baby Browning" in Belgium for several years, on the muzzel of this tiny 6 shot automatic it states .6mm. It does in fact take 25 caliber ammunition.
See link.
Browning did not make ammunition. They branded ammunition made for them.
It will be marked if it is Belgian made.
Europe
Depending on condition,proof marks, and what country it was contracted for, between $250 and $800
100-1000 USD depedning on condition, accessories, box, papers, etc..
You must call Browning.
1968
The barrel will be marked "Made in Belgium"
your browning auto-5 shotgun was made in 1947.