I received a clients Lucien Piccard (Dufonte Model) wristwatch which was his Grand Father's and given to my client just before his Grand Father passed away. Apparently, a timepiece isn't that important in eternity! However, I am unable to remove the back cover. It has the appearance of being a "screw down", but my Jaxa tool just can't budge it loose, even after soaking the back in liquid wrench for 24 hours. I also looked very closely to see if it may actually be a "Snap-on" cover, but it doesn't have any apparent lip to use a case knife on. I am at a loss how to proceed. Any ideas or suggestions will always be appreciated. Bill
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