Can anyone tell me about this stock?

[M1 C FAN]

So I picked up a striped birch stock for dress and it has some markings I`m familiar with. So it has SA on the inside of the forestock a W under the buttplate and a Star FAT 66 on the side of the stock. it also appears to have a cast receiver block no letters just cast marks. any help or information would be great. Thank you.

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