The Rd and numbers are embossed (raised from the surface), right? ...
Yes, James, they are in relief (raised from the surface), and, Cathy, read from the inside. They are upright, thinking of the centre of the bowl as the bottom and the rim as the top, also they follow a horizontal circle. They were certainly punched into the plunger using a hardened tool steel set of alphanumeric punches, and, from memory, using the same set of punches as on other Moore pieces. I've some more Moore in a box somewhere, and will unpack them today and check.
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I've unpacked them, and have examples of 58275, 71753, 80013, 83773, 88124, 94820, 95625, and 95775, dating from October 1886 to March 1888. All used the same set of punches. All are upside down and inside, with the mark positioned at one end on oval pieces, at the handle end on jugs, except for:
80013 sugar — upright with the error,80013 cream — unmarked,94820 cream — across centre of base, upright if you have the spout up and the handle down,95625 bowl — unmarked (the registration is for the tazza shape). So this analysis shows that he attempted something different with the 80013 sugar and got himself into a muddle! The unmarked cream as well as the error on the sugar suggests that this set could be a very early pressing.
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... and, now I've unpacked all my Moore, I've discovered something else, but that will wait until I've taken photographs.

Thanks, Cathy and James, for your interest.
Bernard C.

ps1 — I've always thought of "embossed" in relation to hammered metal sheet, i.e. decoration which is both incuse and in relief, but checking shows that you are right, James. Thanks for the education!
ps2 — James, were sets of punches the mouldmaker's tools or the property of the factory? Over here I suspect that they were the mouldmaker's, as two different sets seem to have been used simultaneously at Sowerby, for instance.
ps3 — "the trademark N is backwards" — how? They must have had punches for other, non-mouldmaking, purposes.