Whilst reconciling old coin tickets I have for coins from the Blackmoor hoard sales with the two sale catalogues (both referenced in the catalogues section of the bibliography page on this website) I realised that I have the type specimen for Webb’s 1933 RIC listing of RIC 914.
My coin, described as IMP CARAVSIVS PF A, radiate, draped and cuirassed bust right, PAX AVG, Pax (or Fides?) standing left with two standards has a ticket that notes it was part of lot 285 in the Christie’s 1975 sale. The lot is described as 20 Pax coins with various other attributes (RIC 907ff).
Looking at the RIC volume Webb notes in the “Authority” column that it is W. 1015, ie cited from his 1908 publication, The Coins of Carausius (reprinted as a monograph from the 1907 Numismatic Chronicle). So, turning to the Webb book, I flip to the entry and Webb’s “Authorities” column reads Selborne. The 1873 Blackmoor hoard was owned by Lord Selborne, having being discovered mid way between Blackmoor House and Woolmer Pond on his land. Thus, the specimen cited by Webb in both Coins of Carausius and RIC is the Blackmoor coin, and, consulting Roger Bland's Coin Hoards of Roman Britain III, there was only a single specimen in the catalogue, number 20448.
Curiously Bland describes the coin as RIC 913var. Although he does not explain what difference he thinks he has seen from the RIC description. Looking at the die axis of approximately 45 degrees from the vertical demonstrates it is the same specimen.