Help re SP cartouche

[Hambone]

Guys,
I've had a stone mint early Standard Products M1 carbine. It came out of Lynn Lugar's estate/private collection. Nothing refinished, crisp unissued condition, but the ordinance escutcheon on the stock is unusual. Compared it to those in my Ruth book and it doesn't look SP. The stock is marked S-HB in the sling cutout. Same with the handguard. Everything is textbook correct SP. It is either an anamoly or someone popped a fake escutcheon in a like new, untouched original SP stock. Thanks in advance for any help.
Regards,
Hambone

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