My dad was given an Omega watch, engraved with his initials on the back, for his 21st. That would have been December '65. He bought me and my sister a gold watch for our 21sts too. I think it was quite an old fashioned tradition; my Grandma must have had to save for ages to buy it for him! Omega still make nice watches. ID bracelets and signet rings are just very '60's I think.