Buttplate ID ??

[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.