I've got a Mike Dirnt signature P-bass c. 2009. I'm fairly sure they were made in Mexico. FWIW I have no interest in Green Day at all, it is just the nicest bass I've played. I see that version is discontinued and now there's only a road-worn USA version at nigh on x3 the price. As far as I can tell the specs are identical and only the worn-ness and country of manufacture are different. Is that true?