Hi Richard,
Paul’s [good, bad and ugly] classification is great, but maybe a more robust approach (“grading” the standard based on some defined criteria) might need to be implemented with the help of the community. Something to discuss at our FIGMAS business meeting at M&M in Columbus OH (end of July). Hope you’ll be present!
About the P&H standards, I personally have no experience with it, but here is their website:
http://www.pandhdevelopments.com/It is likely that the serial “GEO2” is a “custom made” design? On their site, they have two “regular” mount (GP25 for minerals and GP40 for metals) plus a bunch of specific mounts, but the option for building your own.
Beware of the Easter Killer Bunny!
Best,
Julien