Mark 1 serial # vs. year model

[JOEY B.]

I have a Mark 1 boogie 60/100 with the number A1939 in dymo tape underneath the speaker ohm numbers. Is this the serial #? It also has marker pen with the letters RN or RS with a circle around them and the date 4-78 written on the chassis. It had an effects loop put in before I bought it. I hate to assume anything, so if anyone can decode this serial #
I would be grateful for the help.
Thanks

 

[908ssp]

I am not sure what you want deciphered? Mine has dymo serial #A835 has RCS for Randall Smith and the date 1-77 written on it. It appears that RCS also wrote the tube names in the same pen as the signature. The line in and out are stock or at least appear to be on mine.