Certainly the wood choice as well as the external engraving can be generally used for stratification of grade.
But gun companies are in the business of selling guns. Certain brands were well known for putting all the money on the outside, and leaving the inside rough as a cob.
Others extended their extra finishing to the inside.
Don’t forget, sometimes, a manufacturer used different mechanisms between grades. That also effects quality tier.
Learning which models and features are desirable, evaluating condition, etc., are all part of the learning curve for double guns.
And, in my opinion, very possibly the most fun part.
The best lessons are the ones you pay for.
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