Have a near mint 501C, looking the same in an A12 back with matching insert and "ET" in serial number and the proper black WLF for the 501C. Instruction manual would be nice. Thanks in advance. Bill Barber
How soon are you looking for the back? I have an "EC" (from 1995, instead of 1996 like an ET, but it's the exact same model). Ideally I wanted to use it for a upcoming trip, but I might be able to just get by with my other backs instead.