Hi, Don't know if this is the proper place, but there is a 312 for sale on eBay.  Located in Evansville, IN.  It's disassembled and looks good in the photos.  Starting price is $500.  The reason it is noteworthy is that the seller is offering free shipping.  So if someone is looking for a 312, this may be one you can use.  Item number is 170408347520.   Good luck, Nick Brann - K.C., MO