Just picked up to what I believe may be a model 15. Came with original box numbered to the gun. Only thing missing is the barrel space gauge. Original instruction sheet dated 1972. Box is complete in fair to good condition. Gun I would say very good condition. S/N 14505. Gun has high (partridge?) sight and original (big top screw) older rear sight. Having trouble posting pics. Not sure if I'm doing something wrong. Any idea of value. (I may have paid high retail).