I don't really get all this, if I'm honest. I can cope with F, VF, EF & UNC. How can something be nFDC, aFDC or one of the 6 different levels of FDC? How can MS70 be CGS 97, or 3 points higher at 100?
I've given up and adopted Rob's two-point grading system: acceptable or not.
There's a couple on eBay. Apparently it's by Davis. Here's one:
https://www.ebay.co.uk/itm/1838-QUEEN-VICTORIA-CORONATION-53mm-MEDAL-by-davis/162910486913?hash=item25ee38c181:g:9b4AAOSwCU1YniE3
Looks to me like a double strike rotated, if that is possible? The band in the wavy area just below the R of Brittannia looks like the rearward headband on Victoria's head?
First, one of a number of patterns struck in conjunction with Victoria's Golden Jubilee in 1887. A sixpence by Spink / Thomas, ESC 1783.
Second, a 1697 E over Y sixpence.
1807 proof halfpenny.
I suspect this may have originally formed part of a set in gold, silver and copper, with possibly also a bronzed and aluminium example. The rims have been filed on this coin, and are similarly filed on the gold piece. Maybe 10 years ago, I saw a copper proof with filed rims. All this suggests they were done as a one-off on request from one of Taylor's customers. The filed rims aren't restricted to the 1807 either as my Wiener pattern shilling in copper (ESC 1383) also has the rims filed and again is the only example I am aware of. The question is who asked for them? Murdoch?
The 1926 penny is a very under-rated year and you seemed to have bagged a very high grade dolly there. Think nordle has been saving the hardest ones till last.