This note will take another look at the Stuart hammered silver coins that have been countermarked with a cartouche containing various Roman numerals; III, VI, VII and VII above a horizontal I. The five previously published specimens are presented and discussed along with a further piece that might be attributed to this group. The weights of the pieces are found to correlate with the numeral in the countermark, but no plausible explanation for the issue has been found. All of the pieces should be considered as unsolved until new evidence appears.
Cartouche Countermarks Revisited – Gary Oddie
BNS Research Blog 
Hi Gary, Thanks for a fascinating post. It reminded me of a similar Scottish coin that I’ve come across. There is a Scottish 12 Shillings of James VI’s 9th coinage in the collection of the Hunterian that bears a ‘VII’ within a cartouche countermark. It seems similar to no.5 in your post, but I don’t think it is an exact match. The coin is no.1364/H in SCBI 35. Best wishes, Cameron Maclean.
Hi Cameron,
Well spotted/remembered, thanks. Have just acquired a scan of the SCBI image, definitely part of the same series, but,as you say, a different punch. Pretty sure it will fit nicely on the graph of punchmark number vs weight. All we need now is who did it and why!
All the best
Gary