King 3B Trombone, Mid-1970s, Super Mint Silver Plate
This King 3B trombone from the mid-1970s is a rare and exceptional example, finished in super mint silver plate throughout. Known for its brilliance and projection, silver-plated King 3Bs are especially prized among lead and commercial players who want maximum clarity and sparkle in their sound.
This particular horn is in outstanding condition, described as "super mint," and has been closet kept its entire life. It has never suffered any damage or required repairs. The handslide is fantastic, offering fast, smooth action that makes technical passages effortless and supports a wide range of expressive playing styles.
Unlike many vintage horns that require extensive service to restore playability, this example needed no additional service or cleaning — it is ready to play exactly as is.
Today's King Legend 3B models are replicas of these classic 1970s designs and sell for over $2,100, while sterling silver or special finish versions can exceed $3,300 new. This original 3B offers players and collectors a true piece of King history in an unparalleled state of preservation.
Includes the original "coffin" style King case. Mouthpiece not included.
This trombone is now part of our Archive of Sold Instruments, presented here as a reference for musicians and collectors researching King 3B models and their historical value. If you're looking for something similar, check out our current trombone inventory here.
💬 About Silver Plate
Underneath the silver plate, every King 3B — or similar professional trombone — is fundamentally a brass instrument. It is exactly the same core structure as one that would be color-buffed, polished, and finished with clear baked epoxy lacquer.
What we have learned over the years about silver plating is fascinating. In the early days, especially before World War II, most instruments were finished with clear lacquer. However, those early lacquer formulas simply did not survive the test of time; almost no horns from that era still have intact original lacquer today.
If we look even further back — to instruments built before 1900 — lacquer technology was even less advanced and almost always failed. Instrument makers learned that silver plating offered a much longer-lasting finish that resisted wear far better than lacquer.
Here at The Brass Exchange, we’ve seen countless instruments from 1900 to 1940 that still display a beautiful, vibrant silver finish, often with minimal maintenance required.
What does this mean today?
Modern clear lacquer, while more durable than early formulations, is still significantly heavier than silver plating. In fact, lacquer weighs approximately five times as much as silver plating. This added mass makes an instrument feel and respond heavier, slightly dampening the vibrancy and immediacy of the response.
Silver plating, on the other hand, represents approximately 20% of the weight of lacquer finishes. Many players describe instruments with silver plate as having a more lively, resonant, and even brighter response. This finish allows the instrument to vibrate more freely, giving the player a unique feedback and tonal flexibility that many find preferable, especially in jazz and lead playing situations.
Why are silver-plated King 3B trombones so highly sought after?
Silver-plated King 3B trombones are favored for their bright, focused sound and increased projection compared to lacquered models. The silver finish contributes to a slightly denser, more vibrant tonal core, making these horns ideal for lead, jazz, and commercial playing where clarity and brilliance are essential. Vintage examples that remain in original condition, like this one, are especially prized because they retain the authentic King resonance and unmatched playability that modern copies often cannot replicate.
