Originally posted by Fletcher: The "X" would be a "5", meaning this is a 58" bow as measured along the curves from nock to nock. String should be dacron such as B50 or B500, and 54" actual length; measure the old string to be sure. Damon Howatts are excellent bows and yours looks to be very clean and straight. It needs a new rest or shelf rug and it will be a great shooter. I would SWAG it as a late 60's model, but the guys in the collectors forum will have a better idea of that.BTW, Welcome to the Gang!