Thanks for your interest Wmachine. The model number is on the Custom 'certificate of authenticity', and on the warranty checklist dated 10:1:12. It was sold to me as a '61 reissue from a reputable dealer, and due to the appointments – knobs, truss rod cover, pickguard bevel, dot neck etc, I don't have any particular reason to doubt it. I believe a '59 reissue would have the longer pickguard. Have contacted Gibson but have yet to receive a reply...