Quote:
Yes, I would read the price for SG 142Wi to refer to a stamp from any of the four plates.
If varieties exist that fall under a number, the price quoted by the concise tends to refer to the cheapest.
Specialised Vol 1, 12th ed. (2001), so a little older
SG142wi = J19a (plate 17) to J22a (plate 20)
Prices
J19a (plate 17) £ 60 used
J20a (Plate 18) £ 75 used
J21a (Plate 19) £ 45 used
J22a (plate 20) £ 45 used
Quote:
I make it SG#142 5th Feb 1880 2.5d Blue Plate 20 CV: 45GBP
I agree. That specialised specifies when they were put to press
Plate 17: 1880 (this must have been before February 5th, 1880)
Plate 18: February 11th, 1880
Plate 19: April 6th, 1880
Plate 20 (actually it says plate 22 under J22, but that is given as September 6th, 1881 under J23): October 11th, 1880.