Hi, Not sure which catalogue you are using but the shade you mention is not in the 16th Edition of the Specialised which was issued in 2011? In that edition there were only 3 shades noted, in the new Specialised Volume 1 Part 1 just issued (Dec 2020) there are now 6 to chose from. A C9/C9A split has...

Further to the earlier posting here is an extract from the spreadsheet of a Plate 9 collector. I have removed the source names where it is an individual collector.

Just one! Plate8 'SF' state2, Bishopsgate St - Chancery Lane dated 26 February 1841. Althought the external postmark is not very clear the document is dated internally February 1841. As Winston suggested it's a good idea to join the Mulready Group (http://stamp-forums.com) as you might well get more...