The recent board discussions bring up a number of very interesting points. I wonder if this hobby may benefit in the future by unbiased standardized documentation and grading of a piece. I would think that real experts would see 99% of alterations if they study and disassemble a piece. While obviously a gun cannot be "encapsulated" like a coin, it could be taken apart, studied and photo documented with a one or two page summary, detailed photos, and overall grade - could also note questionable aspects even if not certain. For example, if an appropriate group / grading company (kind of like PCGS for coins) were created that were qualified, independent and unbiased with a focus on the historical aspects of a piece, a gun could be submitted for a fee, graded by things such as percent original metal, percent original wood, originality of metal finish and patina, originality of wood finish and patina, originality of bore, originality of markings and decorations, whether "cleaned" (like graded coins are noted as such). I know flayderman touches on some of these things, in a guideline sort of way. It sounds like many collectors speaking out on this forum also apply their own "rules" but there is no standardization. Further, a converted gun lock could then be graded as "original", the conversion being historical, graded much higher than reconverted but not as high as original flint.
If such a system were used, the photo documentation would be kept on file in a database by the grading company - that way in the future it could serve as a reference for at least how a piece later altered looked at the time that it was documented.
possibly as a result truly original pieces (for example guns not touched since converted almost 200 years ago) could see values increase substantially. In a way it would even bring value and historical importance to altered pieces, because someone at least would have an idea of what they are buying without relying on a seller - and others could focus study on aspects of an altered gun documented to be original. Could even introduce many new collectors into the field - those that stay away currently because of these very issues. Would like to hear others' thoughts on whether something like this could be practical / helpful or not. Would any of you collectors be willing to submit an important gun for something like this?