There were a LOT of pruners made in Italy. I just acquired this set - interestingly branded
Seymour Smith. (See the "Ladies Snap-Cut" anvil pruners I recently acuired for my girlfriend in post #8 of that thread.) These use a different type of spring than your examples above:
Here are a couple pairs of Italian-made bypass pruners, each stamped with a different brand name, but both having the same logo forged into the inside of the handles and the same pattern on the handles and both using the "volute" spring:
Seymour Smith also used the "volute" spring on these Italian-made model 124 bypass pruners:
(* sorry about the bicycle wrench image - that was supposed to be an image of the "star in the circle" logo on the "Unsco" pruners - this is the reason we should be able to delete posts! *)