I don't think you are going to find 100% documentary evidence, as far as I know the BLOCK logo was a temporary stopgap, that was only used (1983) while Tokai came up with the newer logo that is used to this day. I have personally have 4 Springys and one Goldstar with this type of BLOCK logo, I see no reason to doubt the authenticity of the Guitars that the mentioned Ebayer is selling.
I missed your q before, but here's my experience and understanding:So far the block logo guitars that have popped up in the flesh have been ST50/55s and TE50/55.
Wondering why I am not seeing higher priced models? The '83 price list shows all the other options available. Odd.
Colors so far:
ST50/55 - FO, MR, SO, PB, GM (matching headstocks in MR and SO)
TE50/55 - WR, MR, MB, BL, GS