Dealers need buy and sell dates and prices for bookkeeping and tax reporting. Use DB or specialized dealer or collector software. Once possessions are recorded in a database, labels can be printed to identify them. Labels can add to the pleasure of a collection, but dealers need labels showing the selling price. Electronically opened cash drawers are available.
Some software even apportions sales among group shop dealers.
Use specialized software. Neat lists in small type can be printed by computer and are easily updated and reprinted. Specialty dealers often sell by catalog. People loaning collections to local museums prepare a catalog for use by docents or sale to the public. Handsome catalogs can be prepared for the printer on a computer.