I'm definitely not an expert on these decals, lol, but I did own an early '70s Bottecchia Professional for a short while. Mine was a cool blue color. The ones like yours, with just an outline of the dove, preceded the ones with a white dove. I want to say your decal is from the '60s, but I could easily be wrong. 🤔 Other folks here know way more than I do, so wait for them.

Whatever you do, be careful of that paint. It falls off if you look at it wrong. 😲
EDIT: Classic Rendezvous has a chart of Columbus stickers, showing yours as "very early" , then the white dove ones for late-60s to early-70s.