Found this interesting for what it is worth. this guy listed one for sale on ebay. Looks like they are MIM. Made in Mexico!!!
http://cgi.ebay.com/ws/eBayISAPI.dll...6104&rd=1&rd=1
Q: IS THAT - MADE IN MEXICO - ON THE BOX? Jun-25-07
A: I believe it does, but I can't tell for sure because of the stickers. I can't imagine this suprises anyone? Fender’s "state-of-the-art" amplifier manufacturing facility in Ensenada, Mexico. Gracious del la interesto.