Need ID on touch marks please

[NWMP]

I have found my first trade silver this year, 6, possibly seven pieces. Narcisse Roy has been identified on a large brooch, but I don't know about the marks on my smaller brooch. What I see is a stamping of a heart with a cross in it, a separate stamping is rectangular and it reads to me : I W, or if flipped, M I. The letters are quite separated so I suspect initials. I'll try to put up pics but I'm unfamiliar with this format.
I just found four more pieces today after posting this, including another large Narcisse Roy brooch. (tractor damaged though).

 

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[Lucas]

IW: unknown maker.

See Covenant Chain, p. 121.
Lorraine Cross,
Mark IW
Unknown maker
Heye Foundation


I would say this is a significant find, and the associated NR pieces help fix it in time.

What river are you near?

 

[A. Grignon]

M. Hamilton (silver in the fur trade) suggests "I.W." to possibly be John Wood (circa 1782).
Says he was "Associated with for trade silversmith Narcisse Roy. Seems that this could be a possibility, especially with the NR silver being found at the same site.

 

[Lucas]

Barbeau (1940) gives dates for Roy as 1801-1806, but DCBO say he had finished his apprenticeship by 1786. He died in 1814.

Haven't figured out if he is a relative of mine or not.

 

[NWMP]

I drew up a rough sketch of the other marks on this same piece. It was plow folded and I was afraid of snapping it. I'm taking all pieces to a jewelers this winter for straightening out. I suspect this piece to be English, but I really don't know.

 

[Lucas]

OK I'm not great with silver marks, but I do know if they don't match exactly, they aren't a match. These are Brit style marks, but I can't find the city mark that matches the heart/cross. The Y is a year mark, and the head is the Geo. III duty mark. The only year mark that I could find that was exactly the same was Edinburgh, but your city mark isn't.

It's possible these are pseudo marks. I know they were common in the U.S. ... Canada maybe. So IW would be the maker, and he dressed up his stuff with a bunch of made up marks. That would be illegal in England but not Canada.