See @BizballMaury's Tweet on Dec 26, 2018 on Twitter / Twitter
Question: Is a 1966 Firebird XII(or any other firebird) an offset guitar? This just came up in my head and I needed to ask this, please answer. : r/offset
Used Cozart NON-REVERSE FIREBIRD 12 STRING Electric Guitars Sunburst Electric Guitars
1966 Gibson 'Guitars & Amplifiers' Catalog, Page 12: Firebird III, V and VII >> Vintage Guitar and Bass
Gibson Limited Run Neck-Through 12-String SG Electric Guitar - YouTube