Charlie Sheen -- Another Porn Star Runs Out of Time

Charlie Sheen's Rolexes don't always end up in a porn star's vagina ... sometimes his skin flick chicks try to sell them at famous pawn shops.

Louisa Lanewood tells TMZ ... she moseyed into The Dina Collection in Bev Hills Monday with a $5,000 Rolex Charlie gave her during their fling last year.

She chose the right shop ... it's run by Yossi Dina, the star of "Beverly Hills Pawn." We're told she had the watch evaluated -- he offered her $3K but they couldn't hammer out a deal, so she left.

As for why Louisa wanted to part company with the timepiece ... she has no attachment to it anymore since she's over Charlie and wants someone else to enjoy it.

Guess who had a REAL attachment to Charlie's watches -- Capri Anderson. Click here for the inside scoop about that.