Reynolds 653BH88-89 (set of 3 only)

I have no date for the introduction of 653, but I would guess about 1988 or 89. It sat between 753 and 531, with a tubeset quoted as only 50grm heavier than 531. This is the first version – sometimes with “531” in the address box too. See similar notes on 531 and 753 above.