I'm a Professional Woodwind Player, Teacher and Repair Technician. This is a Wonderful specimen of U.S. Craftsmenship. A 1979 Resin Body with a set of 1989 Keys that I installed. Artley made the Models 17S and 18S Clarinet and also Stamped them Armstrong 4001 for that Company. The Keys on all 3 of these Horns are interchangeable. Try getting a replacement Key for one of these Chinese Horns that are on the Market today. It comes with the original wood frame Case with storage and Books compartments in good condition. When it was New it sold for approximately the same as a comparable Yamaha that is today the YFL-255 that sells today for the deeply discounted online price of $1053. +tax. Mine is only $299. Thanks