Just picked up, amongst some other items, a small (5-6) selection of these cars, which I had never seen (especially the trick couplers) before. My limited "research" leads me to believe they may be rather less than common? Condition is only C4-C6, but am wondering what - in general - they might fetch. They WILL be for sale, as my only interest in Marx is the 3/16" scale freights that I run behind my 3/16"-O pre-war Flyer locos. Thanks in advance for any help/info!