Buttplate ID ??

[USGI]

So GI Bob,
Just what are you up to?

The real answer, and I'm not getting much accomplished on it right now, is to determine if the buttplates on my 476K and 408K Inlands are original "square pattern" Inland plates or Winchester. Either I don't understand the CCC site's explanation, or will need to explain to a future owner why they aren't original. I took some pictures today of the stocks they belong to, but can't see meaningful imprints on either one of them. The 476K stock is on the left and the 408K is on the right in all (4) pictures. Only thing I can see for sure is the wood grain and milling marks. I can take higher resolution pictures if you think that would help any, but don't believe there's really anything there to see. - Bob

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[Matt_X]

Can we expand this discussion to the Saginaw/Inland buttplates ?
Is there any pattern of usage observed with these and/or the missing dimple buttplates on SG stocks?

I'm assuming the Saginaw/Inland butt plates were made by Seymour Products.
In Ruth's WB! and III Seymour Products, Seymour Conn. is listed as a Butt Plate Supplier for both Saginaw and Inland. B200997

In WB III Proos Mfg. Company is listed as another subcontractor of Butt Plates to Saginaw. However it seems unlikely to the missing dimple buttplate, if made by Proos, would look so different from the buttplates they made for IP and then Grand Rapids Saginaws.

In 2005, an unknown person claimed to have microfilm copy of 1943 Saginaw subcontractors and spare-part subcontractors.
Micro-film Notes On Saginaw SG Butt Plate Manufactures... | Gun Hub Forums
He claims a Shelby Spring provided 26,000 spare buttplates. That might explain the plethora of NIW missing dot buttplates. I'm a little suspicious this is a little too convenient.