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I would say that device came with the production runs of the VR1000. Manual field adjustment was not recommended for quadrature error.
If you've ever played with dihedral error on a helical machine, you know what I mean. Most likely that unit was left over when the machine was "Allenized". The Allen kits replaced sections with solid state.
Besides monochrome timing errors, there were color errors that had to be corrected too.
In RCA it was MATC and CATC which in Ampex was called Amtec and Colortec.
Attached, technician checks an Ampex Mark III headwheel panel.
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