The relevant volume of BMC can be downloaded from the web but unfortunately #10 and #11 are 'blacked out' and many of the plates are poorly scanned. The attribution by the seller seems likely to be correct though, the key difference in that group is 'king diademed' vs 'king helmeted' and otherwise the mark to the right of Athena (#12 has a similar symbol as the one you are interested in).
If you want to google for a download, the title of this subsection of the catalogue is "Greek and Scythic Kings of Bactria and India" - don't forget "British Museum" though.
If you want to google for a download, the title of this subsection of the catalogue is "Greek and Scythic Kings of Bactria and India" - don't forget "British Museum" though.




















