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The ID plates on the handling fixture.

The blue tag reads

Ground Support Equipment

Part Name: Nozzle Extension Handling Fixture
Part No.: G 4080MD1
Contract No.: NAS8-6504
Date of Mfg.: 5-66
Stock No.: [blank]
Model: [blank]
Serial No.: F-1020
Spec No.: [blank]
Weight: 1525
Insp: [some sort of inspection stamp]
Rocketdyne
Division of North American Aviation, Inc.

The black tag reads

Working Load: 2000 lbs
Proof Load: 4000 lbs
Inspection Date: 9-68