This is a King Super 20 Supersonic Symphony model made in the early 60's by King (H.N. White Company). King had a long history as one of America's great brass instrument manufacturers and the Super 20 was their top of the line professional trumpet of this era. The Super 20 had several different variations and this one is the most desirable1049-S Symphony (solid Sterling Silver Bell and mouthpipe) dual bore .458/.468" Information from the 1963 King catalog for the 1049-S can be found at this link: 1049-S
The models are listed in the catalog as having lacquer bodies, which is typical, but this particular trumpet has a silver plated body, which appears to be factory original plating. A couple of years after this model, King introduced the Silver Flair, which was a silver plated horn, so it seems likely that they began offering the Super 20 in silver plate in this time frame.
The bell has a Sterling Silver stamp and the valve casing has the DB stamped for Dual Bore. This trumpet is in very good condition. No dents or signs of past damage.
In addition to the great condition of this collectible trumpet, it also comes with the original case in good condition. The latches don't spring, but still catch.
Solid silver leadpipe
Sterling Silver bell
Dual Bore .458-.468
Silver plated body with nickel silver slide tubes