This is testing my memory a bit, but I think LBR is correct. The X' s mean pounds and they put them either before or after the draw weight to show which way they run, light or heavy. Usually they marked even 5 pound increments and then the X' s. Like 50xx would be 52 pounds and xx50 would be 48. 45x would be 46 and x45 would be 44. Why they didn' t just mark your bow as 50 pounds without the X' s is beyond me.

I' ve got a Colt that' s marked 50xx, drawing it to 32" and hitting 66 pounds, with some stack. Too heavy for me to shoot very consistently, so I just shoot it for strength conditioning. Sure makes my 55 pounders easy to handle.