I am always especially interested when stamp collecting (philately) and paper collecting (ephemera) intersect. When I found this trade card, it brought to mind a one-page study of 19th century postage stamps which I bought years ago from old-time philatelist Woody McLellan. Woody and his father Hugh McLellan became interested in the fact that when postmasters of the 1880s made their own stamp cancellers by carving the ends of corks and rubber stoppers, sometimes they used size-numbered rubber stoppers without removing the numbers; so that sometimes an observant collector can find stamps and covers showing a cork size in the center of the cancellations.