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Nozzle extension ID plate. It reads

ROCKETDYNE

A Division of North American Aviation Inc.
Name: Nozzle Extension
Spec. No.: WT. 1616 lbs.
Mfgr: Rohr Corp.
Part No.: 209210 Assy.     A 512 7
Serial No.: 8285565

Rocketdyne apparently had at least two vendors for nozzle extensions. This serial number is earlier than other nozzle extensions which I've photographed and was manufactured by Rohr Corp. Other nozzle extensions, with later serial numbers, were manufactured by Precision Sheet Metal Inc. (e.g., the F-1s at the Michigan Space & Science Center and in the JSC Rocket Park).