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I assume Peck was referring to currency pieces? And presumably when he says "care must be taken" he's talking about beginners, or experts making hasty, superficial, lazy, or downright dishonest judgements?

Horses for courses. I find my iPad is great for TV and radio, music and audiobooks, email, quick notes and reminders, browsing, taking photos, etc. But Photoshop and database management, even proper word processing, have to be on my Mac, there's no tablet software that's as powerful (yet).

The US used 16 fl oz to the pint, hence the pint/quart /gallon being .83 of the size of the UK equivalents. The one thing with Imperial is that it evolved to fit humans- some measurements like rainfall end up with double or even triple figures, difficult to envisage, when using millimetres, whereas "Bloody hell, we had 3 inches of rain yesterday" makes sense, especially when the exact amount is not important. '75mm' means '75mm', whereas '3 inches' can often mean an amount that just looks about right, but may be actually 2 3/4" or 3 3/8", but who cares? '75mm' is what a person running a weather station would say, but '3 inches' simply means it pissed it down. You have to look beyond the figures, and how the units relate to people.....:-)

This https://tiranti.co.uk/products/brown-bronze-powder-100g/ should help explain how bronzing was achieved.

At the behest of your suggestion, I tried both. I got much further with Peck than Google, although still not clear what precise chemical agent was used, or exact procedure followed, to bronze the copper. But here is what Peck says at page 220 (last paragraph) of the 1964 re-print:- Not 100% crystal clear whether Peck was referring to currency pieces which had toned down, or to copper proofs. If currency pieces then other features can mark out the distinction between them and a proof. In the case of KP31, P1326, for example, the fact that the 0 of the date is incomplete and the 1 has no base serif. Also, the reverse is not inverted, which it is on the currency strike. Peck continues:- Rather an obvious point but worth repeating. At page 405, Peck states:-

This is a more comprehensive list than Sear, which may help: https://www.wildwinds.com/coins/ric/commodus/i.html

Freeman already been finding varieties ?

South Sea Bubble...

Pfffft. THIS is the one you want... https://www.ebay.co.uk/itm/255045123269? I mean, how often is Half A Crow offered on eBay?