Brought back some memories that read did. I bought a full FT-101E series station back in the late 70's from Greg Whiter down in Mitcham, Victoria. This set up retired my FT-200 series HF station.
FT-101E, FL-2100B, YC-601B, FV-101, SP-101, FRG-7, YD-101 and an FT-220 2m base station too.
Served me well for many years before I upgraded to FT-901DM (nice radio, drifted a bit), then FT-ONE (utter junk box, full of dry joints and rusted out after stint in tropics) and followed with an FT-980 (beautiful radio & exceptional on CW) and last FT-1000D (best Yaesu ever owned before receiver died this year!) before switching to Icom and Kenwood.
As mentioned in the article on the FR-101 the YC-601B external digital display also came with two different colour read outs. The earlier ones were green and the later (and last) were red. This may apply in the case of the FR-101 series.
Jack VK2XQ