I have a couple of Sherpa 320:s (and why "Sherpa" 320 as the case back features the jumping shark and not the oyster with pearl the Sherpas have?) and a 340 that would benefit from new crystals. I asked my generally very competent watch guy, but he said he couldn't find a new one for the 340. I have tried to find crystals searching the internet without success. G-S Supplies have a catalog with thousands of variants, but nowhere does it tell which watch model they would fit. Does anyone here know if it is possible to find new crystals for 320 and/or 340:s?