Hard to tell what it's worth without pictures of the whole car but a windowless HZ Palais white 308 4sp with black trim is a fairly desirable and looking to be mostly original with most the hard to get bits it would probably go on Ebay for between $6000 to $8000..... a couple of bidders really wanting it and it could go higher.

It is a confirmed Sandman so more valuable than those without proof of Sandman heritage.