Comgrats coins92,
Imo, your ccf is a more desirable find than the finest condition Dug 'Regal Issue'.
I've been searching and researching

a particular NH boatyard f
or years,
apparently the locals made up their own pocket change from GII ha'pennies right up to
Shield nickels.
Also found were two carefully made coin impressions in lead sheet.
I often find cancelled (hammered, scored or holed) examples near the bridges enroute to the nearby towns
Tollkeepers knew their coins, back then anyway
Had a dozen examlpes xrf'ed a while back, all were a mix of tin, lead antimony, and other metals, one had almost 4% gold, go figure.
Judging by the seemingly random alloys, they were made with whatever was on hand for scrap.
Examples w lead as a minor constituent look quite similar to your recovery, was it recovered anywhere near salt water?
(real or fake, that salt effects coin metal far from the shoreline)
As with dug pewter buttons, they can be unstable after recovery,
Sometimes ill paint em w slightly diluted white glue, without treatment,
Ive had them literally turn to dust in storage
here's a high tin GII (GLUED), for comparison.
You just never know what you might dig up next,
I just love detecting, and collecting, and learning

Thanks for posting that beauty, millions of regals struck, with relatively few fakes. HH.

