In my case I bought a 20 gauge 21 sold in 1941 as a Field grade. In 1946 it went back to Winchester to have the wood replaced and the gun engraved with the grade 6 pattern.
I paid as if it was a Field grade with non factory engraving since the factory records indicated it was sold as a basic field grade.
After purchasing I was able to get the records from Pauline showing it had been restocked and then engraved by George Ulrich.
I feel that in this case the factory work added some significant value to my gun.
I have since added a 410 and 28 gauge barrel set I purchased in the white. Im not sure how much value the factory engraving added but I like to think
It adds a fair amount I Just hope the added barrels which were done 100% correct will add some substantial value to the gun when it is time to part with it.
