It's winter! Nobody wants to look at a convertible when they are freezing their kiesters off. lol
Seriously, from mid/end of September until about April, cars don't sell well. This is especially true of classics.
I would also recommend adding a photo of the front seat area in your book.
I think the price is ok, just the wrong time of year.
65 conv "C" code - modified
68 California Special