Vintage Zildjian cymbals did not have ink markings to indicate what the specific use for the cymbal was, or they could have been worn off through polishing. (by the way,polishing the cymbal does not necessarily increase the value,particularity older vintage cymbals.These cymbals sound better with age, and most older cymbal buyers want the "patina" or dull finish) The cymbals sound is produced through the diameter and thickness. The same diameter cymbal could be a  Ride(light, med,or heavy), Crash (light,med or heavy). The same goes for Hi-Hats. The cymbal model is determined by weight. Grams is preferred, but ounces will do. This information only increases your selling price. There are buyers for all types (weights!) of these cymbals. However,when describing your cymbal without giving the weight you lower your ability to recieve top dollar. Buyers are reluctant to bid on a cymbal they do not know its intended use is. The intended use is gauged by the weight. You are going to have it weighed when you ship it,so why not increase your earning and selling power by including the actual weight in your add?  Bath scales will not work well enough. Any good retail store scale in tenths of a pound will provide enough info to interest all buyers, and get top dollar from your cymbal sale!!