Assuming you are correct in the serial number being A0811, I would date the guitar as 1968 based on my archives.
____________________ 1965 Mosrite Celebrity Prototype with Vibramute 1972 Mosrite Celebrity-III 1977 Gibson MK-53 1982 Fender Bullet 1994 Gretsch Streamliner G3155 Custom 2005 Gibson Les Paul Standard Plus 2006 Jude Les Paul 12 String