need help, lost my book. my N0.4 s details?

[jrhead75]

It was produced at ROF Fazakerly, and from the S/N prefix, most likely in 1944. 1948 should be an FTR date.

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[eddystone3006]

It was produced at ROF Fazakerly, and from the S/N prefix, most likely in 1944. 1948 should be an FTR date.

thanks!!!!!