Ronson Lighter/Cigarette Case

This particular model is obviously the Ronson Mastercase. It was introduced in 1933 and marketed towards distinguished gentlemen. It was a pretty popular model that held about 14 regular size cigarettes, and the line survived for 20 years since its launch. This could be an earlier model which may bring up value, but even a later Mastercase in great condition is worth a lot of money. Earlier models have wider "rabbit ears" on the top where the flame comes out compared to the slimmer "ears" of later examples.

If the lighter case you own truly is in mint condition with all paperwork, I could see it going for $250+ USD as a CIB item if you ever decide to sell it. That is, of course, the true collector's going price; if you sell on eBay, you may sell to someone who doesn't know the true value and you may let it go for as little as $10 plus shipping unless you set a good reserve price...