A lot to assume here. What is the condition of the grills, fabric, wood rails? The audience of buyers for Dahlquist in general is dying off, so maybe $700 if great, $500 if OK and 400 if they need some attention.
DQ-10's aren't like a vintage car. Original caps make them less valuable IMO. My suggestions assume a local sale. Not worth shipping unless you find some dope willing to shell out huge $ to do it.
SpongeSound