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There is no Hillsman or variation in Cutten. To save you the effort. there is also nothing in
Kentucky
South Carolina
North Carolina
Virginia
West Virginia
Vermont
Philadelphia
NY (and NYC, Utica, Albany)
or any general reference that I have

This was not unheard of. Revere practiced rudimentary dentistry, as did other smiths. Aside from their knowledge of metal working, they had tools more applicable to small spaces than the local blacksmith.

Interestingly, all the "Hillsman" entries I search in the 1850 were either in Georgia or Tennessee. It is certainly possible the surname was creatively spelled, so the pool to search could be far bigger.

Possibly Henry St John Hillsman (1814-?), enumerated in the 1850 Morgan County GA census as a jewel[ry] merchant.

As a note, the "1790" on the O.R piece is a later 19th century addition.

The G•R mark is listed as unidentified on a spoon at Winterthur. The flanking marks have been found on pieces by William Hamlin, working 1810-1860 in Providence RI. The O.R is unrecorded that I have seen, but its flanking marks are found on a number of Philadelphia pieces by various makers and retai...

This set of marks represent an unidentified NYC wholesale manufacturer presumed to be associated with Albert Coles. They are only found on hollow-handled pieces such as this and match his handle die designs.

Yes, Peter, thank you for that.

Sorry, I expressed myself poorly. That is the loth mark used in 1847 and it was actually the Austro-Hungarian Empire at the time. The rubbed mark may indicate a city.

I believe it is Polish and date marked [12] for 1847. The form is typical and Sidorski is a mildly common surname there.

If it was sterling, it would be marked as such. If not, it may be coin, thought that would likely have been marked, as well. Given the name only, it would be best to assume plated goods until proven otherwise. N.B. An acid test means nothing; each piece would need to be passed thorough an XRF detect...

It is Bailey & Co's standard mark for sterling goods.

Silverplate. If they were sterling at this date, they would be stamped as such. The firm was the big box retailer of its day. More information can be found here: viewtopic.php?t=44663

I suspect the original pot was "renewed" by Morgans long after it was retailed by BT&B, who became Ball, Black & Co in 1851.

Morgan Morgans after the dissolution of Montgomery & Co (Samuel Montegomery and Morgan Morgans) in 1876. The original mark was Beehive/M&M in a diamond/arm & hammer. The center diamond was removed and the space left blank or, as here, filled with N•Y.

This is probably way late, but the mark is for DUNN (David) & CANN (John), NYC, 1836-1837. They supplied silver hollowware to various retailers, including Baldwin Gardiner.

His initial mark -- shown in Hollan's Philadelphia -- is A • S

Alexander was several times bankrupt after the short-lived partnership c 1796-1797, with Wiltberger. Failing in a shop of his own, he worked for Anthony Simmons before formally becoming his partner in Simmons & Alexander, c 1804-1808. Sometime after he moved to Richmond VA, likely to escape his ...

Neither Alford or Allardice are mentioned in Hollan's Philadelphia, nor any makers with the initials SA.
That form of foliate back (from what I can make out in the image) was more popular in Boston c 1775-1790. That said, I do not have any likely candidate to offer.