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It sounds like you tried to open the Opinel with the locking collar locked closed, is the metal collar still on it? That's the only thing that I could possibly think it could be. Was it unusually hard to open, LOL?
Isn't that the one Ernie added? Look on the post from page one.That does not look like the knife I put in the box. That one shows some patina, quite a bit of wear to the printed logo on the handle, and some work on the blade. The one I put in was unmolested NIB. IT also had the new style locking collar, with the nub on the collar and the milled groove in the bolster. That collar was designed to prevent just what happened to you. You probably would not have been able to pop off the lock ring just by trying to open the blade. Something is fishy here.