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Barring unusual defects elsewhere the only 2 parts that have to be changed in a rebuild are the heater and cathode (and you can just recoat the cathode if you're desperate). Smaller rebuilders typically bought gun assemblies, but larger opperations could have made or rebuilt in house. If it was rebuilt in the late 70s-90s after new guns were NLA or during the color shortage (of IIRC 1967) they may have been best served or limited to cathode/heater replacement. The gun needs to be essentially clean room grade clean so they ain't gonna scrub or grind old makers marks off the gun.
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