Well that's cool...1988 and 49th built that year. It's rough for sure..and it still rides just like a Fat...amazing ride !! I've owned a NY Yo Eddy ! And ridden an early Wicked...Wonder what the A denotes ??
Gotta admit that I'm stumped by the A as well. May have been an employee bike and they added the A to the SN. It's definitely a 1988 Fat with cantilevers. Since regular Fats at that time came with chainstay U-Brake mounts standard, the A may have been for seatstay cantilever mounts (which were standard on the 1988 Wickeds). That's my best guess gang