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Somewhat doubtful that it could be an American mark, but, R/F 4th indicates one John Burgess (with no known mark) plating in Baltimore in 1864, related to Caleb H. Burgess (no mark) with both together from 1865-1883, then Caleb alone 1884-89. Here's an 1880's electrical source directory listing Amer...

If you follow the linked chain of pseudo-marks, like a mixture of fingerprint sets from one person, Trev is suggesting that this may have previously been an incorrect attribution for your mark to the Continental (Sheffield) Silver Company which should have more appropriately gone to the Crown Silver...

Oh boy, are you in for it now! Hope you enjoy reading this search for the true identity of the silverplate maker Continental Sheffield: viewtopic.php?f=38&t=41910&hilit=continental+sheffield

The BBC couldn't come up with a mystery plot this convoluted.

Some on him as pewterer (exhibition related material): https://exhibitions.nysm.nysed.gov/albany/bios/w/hewill1497.html If Thorn was right, no mark was readily available as of 1949, but someone found a reference before that pinning the name to silver. Perhaps within Henry Wills' "Accounts"...

Rainwater/Redfield (4th) has this form of mark down for Smith & Smith of Attleboro Mass., later part of Wallace Silversmiths. Sterling cigar boxes and novelties were known products. Do you have measurements?

Thorn's Silver & Pewter (1949):

Many thanks for the solution Cheryl!

Salina Coffee House (Salina Kansas) was started circa 1947 as an equipment and furnishings provisioner in commercial sector, eventually evolving into the full line supplier Sunflower Restaurant Supply. It could be a possible branding name, but the date seems late as much of this product was moving i...

This makes two of these well-worn Windsor style soda/ice tea spoons surfacing on opposite coasts (the other is a current listing) bearing this unidentified mark and no more. There's a Salina Street in Syracuse where some jewelry firms were located, and the town of Salina Kansas. The City of Salina w...

Biographies under Johnson, Merle M. (JC has him as firm manager on buying trip to NY) states "manufacturing jewelers". (Also notes business as H. F. Wichman & Co. when he enters field, but as H. F. Wichman & Co., Ltd. at the later era. Probably would not affect the marks on metals ...

Point 1- The Sterling and Wichman marks on the tongs (& a different pair on Worthpoint) do appear to derive from a singular source. Point 2- The "F" in the Wickman mark has that overhang, which is excessive, that may be unique to the stamp source. Not sure if it may be seen on other pi...

Some known Wichman (sans serif block letter) marks: https://www.silvercollection.it/AMERICANSILVERMARKSWXYZDUE.html There is a current listing at "that big store" site of one of the typical enamel Hawaiian "coat-of-arms" pin/brooch/buckle set objects which have previously been al...

I could only see a few samples, but it appears as though H. F. Wickman & Company used block letters on pieces that carried Gorham maker marks, and this form of lettering on items without additional marks beyond Sterling. Is there a supposition that this distinguishes a maker rather than retailer...

Maltby, Stevens & Curtis Company became Watrous in 1896. Possibly related?

Now the squigglies have meaning! I was beginning to think some upstart modernist wanted to commemorate a vacation trip to Stonehenge. But 8-balls for the dead guy makes more sense. I guess the odd outliers at the bottom aren't yellow "Peeps" in this case. Much thanks, Cheryl!!

Three tower assay mark for 1919. CFH mark for master Christian F. Heise. No maker mark. Pretty sure this one has come up before, but not certain if a pattern identification was made?? At least this gives some dating. Best description..squiggly "S" like a snake. TIA https://i.postimg.cc/W3Y...

While the original images are lost, we can borrow some photos that highlight the rather plain decoration of the Reed-Barton #875 line (below). From what can be found, #875 & #1575 seem to be the same line with a patent date of 15 February 1898. Creamers, sugars, pots, and round undertrays are kn...

Another related (or not) element of this drama: Sir Ernest Henry SHACKLETON served in this intervention front attached to the British command.

Notice the "5" after the "M" is in the same style as those in the 515, but the "4" differs from the one scratched in the address. This says two different hands here...one in the workshop, and the other sometime later by the retailer or an owner. I'd look closer at this ...

Don't toss it out yet. Why do you believe it is silverplate? Can't be sure with the photos, but coin silver might be possible. Is that blurred lid mark an "M"? The 515 is probably just a pattern number, but the scratched M-sequence could be an order or factory/workshop control number.