There was no backup for the #1 at all. The Dano was always tuned to DADGAD and it wasn't used for anything other than White Summer/Black Mountain Side, which was dropped in 1970. I think it's realistic to say that Jimmy didn't carry the Dano on tour at all until 1975 (for IMTOD). The EDS-1275 was never used for anything other than STH, TRS and TSRTS.