Just haven't seen this denomination out of this mint, so I'm wondering if it's real. Just saw a picture of the two bits, but not this one. Thin little bugger, I have to say... EDIT: Oh what the hay, I'll post a picture...coming right up goofer...
Eddie, according to the SCWC, the Potosi mint minted 1-real pieces of this type from 1773 until the early 1800's. Your coin look OK to me, just worn. It should weigh 3.384 grams.
