Hmmm - I wonder if Barn had any in his pocket when he was chained in his coffin?

27 Hidden Treasures That Could Be in Your Attic Right Now - Old money

If he had any, Barnabas could have used them to supplement the jewels!! 

I wouldn't be surprised. Actually it's a good thought. He could sell the 1790's money to get new clothes after getting out of the coffin.

I definitely remember when I was writing for my own vampires one of the gals had a piece of eight lodged in her purse, along with other tidbits from various decades.