As I worked to thoroughly clean and evaluate my next project, it struck me how much inside a movement is considered replaceable. No one would bat an eye at a new mainspring or hairspring; balance staffs, jewels, case crystals, all replaceable. I'd even wager that a new wheel or two if done right would be considered fine work. Then came the question of "how far is too far?" The movement is a Waltham Riverside model 1888 and has all matching serial numbers (6984926), even the dial. It has it's original case as well. The Pocket Watch Database states the movement was produced between 1898-99, with a run of 1000 and a total production of almost 56,000. The watch had been stored improperly, with damage to the case which let the humidity dissolve most of the case and plate screws that weren't brass or tightly covered by something else. The mainspring came out in 4 pieces and the hairspring was covered in rust. There was damage to the winding gears and the main wheel staff, several cracked and chipped jewels and broken stem. The dial is severely damaged with cracks and chips (although the chips were in the case so at least they're all there). All these things are fixable and the most important parts will be original, but where does the collector draw the line or when does the watch become something different than it was to begin with? Is it important to retain the original dial, gear train, balance cock etc? More a philosophical inquiry as the watch is an heirloom so monetary value of no importantance in this case but when do repairs begin to negatively affect the watch?