6128-6/12 Double Neck
We're not exactly sure who was asking for Gretsch double-necks, and we've never seen one in the wild, but apparently someone in Savannah felt the world needed a six-string/12-string Duo Jet in the '90s.
Both sides used pre-Fender style ceramic Filtertrons and the unloved ABM adjustamatic roller bridge. The 12-string side used a modified G-Cutout tailpiece (part number 6000-12C-12) while the 6-string side had a V-cutout B3. Both necks had '57-style humped block markers.
0 examples are in the Gretsch-GEAR database.