www.925-1000.com

The “D Hammer A” mark is explained in here (scroll down): https://www.925-1000.com/dm_General.html

Welcome. Images should be embedded as not everyone will use links. Information is available to help you do this. That said, here are your images re-posted for viewing:

WEV’s accounting of the order of Platt marks and family links (the alleged George “Washington” Platt working in that area at least as an assayer is not mentioned): https://www.americansilversmiths.org/ma ... 117813.htm

Re-check the back side about half way down a center line and look slightly right…might there be some numbers and letters buried in the detail there? Might just be photographic illusion, but I believe there are 8’s, J’s, and perhaps a D in there.

Gerity Products is found listed here in the top of the right column: https://www.925-1000.com/silverplate_G.html

Sample large coin serving spoon (9 1/8”) from Platt & Brother, fiddle with front tipt, set among a variety of pieces to display the relative difference. Note the bowl’s liquid volume is only equal to that of the modern era Oneida stainless serving spoon, but the overall size is quite large. The ...

Information linked concerning George Wood Platt and his brother (s) as well as George Washington Platt (son?) and those connected by family line or marriage. This sample might raise questions as to the useage of the “Platt & Bro, N.Y.” mark in the latter half of the 19th Century rather than the ...

Some linked notes on George Wood Platt (earlier) and George Washington Platt (later) and relatives, marriages,etc. : http://www.potterama.net/private/Genealogy/d18.htm

Willkommen, re-posting 3 of your images for marks:

For reference only-A basic Dresden date code letter chart was posted in here: https://www.925-1000.com/forum/viewtopi ... er#p140517

Apparently, not the first inquiry on Heart-Pd mark and in England too: https://www.925-1000.com/forum/viewtopi ... t+pd#p6059

Just to start, let’s classify this as a Knot Pattern and, for search purposes, throw in the keywords Knotenmuster as well as Gordian Knot. Beyond that, can you get cleaner marks or better images? What do you read as the two letters in the squared mark…I. E., R. E., other? Can you read what wording i...

Extra word references for knot patterns: Gordian Knot and Knotenmuster .

Same source (?) in 1824: https://www.925-1000.com/forum/viewtopi ... au#p180987

Re-posting 3 images:

Re-posting your key images in a slightly larger format for easier viewing:

Additional. Getty Images 1940’s photo of actress Esther Williams dining at the Fred Harvey restaurant in the Los Angeles Union Passenger Terminal (LAUPT) can be enlarged to reveal that the Syracuse China “Encanto” pattern service was on the table, clarifying what appears in all those other fuzzy pho...

So, the assay office code here that looks like “TM” should actually correspond to “PM” for the correct location according to the linked chart.

Looks like you got it. Congrats.
Re-posting larger images 4, 3, & 2 (#1 won’t click on):

This does not preclude the possibility of North American platers.