My FC-50's Serial Number is 8424. So, it was made in 1984, according to 2 different articles on Takahashi, up until Tak started using a Letter + Number scheme, the first 2 digits in the SN are year made...
So, the Seller was most correct among all the date estimates made on it thus far.
(Couldn't find confirmation on an official Takahashi document, but I asked Mulder & Sculley to check the X-Files.)
Edited by Bomber Bob, 08 September 2020 - 08:04 PM.