"custom ordered"? If you don't know the truth jus make something up. Regular line item.

http://www.greatplainsaudio.com/vint...spec_sheet.pdf

As the sheet says, 739A has 755C. 740A has 403A. Same wooden box.Make the box a little bigger and cover it in vinyl and you have a 1207-

http://www.lansingheritage.org/image...-mi/page09.jpg