Don't you love it when they just fall in your lap? We search and research and someone just hands us something from a cash register. Too bad you didn't realize it then, you could have asked for more dimes!
i wouldnt imagine it was in modern circulation for very long. it would be worn to a nub if it had been clunking around in folks pockets for 100 years! i think some kid got to dads coin collection. sucks for him, but awesome for you! nice find!