I have the hard copy of CH9 and it is
very good, but older than the references that now seem to be used by some major
auction houses for
attribution.
Using
Callatay 2012 and
Prokopov 2018 I arrived at a dating for
Prokopov Groups IX and X of circa 115-100 BC. However,
CNG is currently dating these
Prokopov groups at circa 140-110 BC. I've found that
CNG often has their fingers (and minds) on the most up-to-date info, so I was wondering if there was something else out there. Next time I contact them I will ask.