It would help if you knew the exact model you've got. Some are more desireable than others. Here's a link to old Pearson catalogs. You'll have to wander around a good bit to find it, but I'm sure you'll find it eventually. I'd suggest starting around 64 or 65 and working your way forward in the catalogs.

This info has been on the web for awhile, but the site has moved to a new location. You guys that had it bookmarked need to update to the new addy.

http://www.archeryarchives.com/pearson1.html