Overview
King 3BF Concert Trombone serial number 463873 dating from the early 1970's. Upon inspection, this instrument appears to retain its original lacquer and factory components and presents as a well-preserved example of one of King's most successful medium-bore F-attachment trombone designs.
The slide is in good playing condition with clean inner tubes and no excessive wear or notable defects observed during inspection. The water key functions properly, the rotary valve operates smoothly, and the linkage remains solid and responsive. The bell section is free from evidence of prior damage or repair, with no visible creases, significant dents, or signs of major past work.
A small indentation is present on the lower knuckle exiting the valve section. While a qualified technician could likely improve or remove the mark, we elected to leave the instrument in its current condition as the blemish is minor and does not negatively affect performance.
From a playing standpoint, this instrument delivers the sweet, centered King sound that many players seek. Response is immediate, articulation remains clean, and the instrument offers the lively feel that helped establish the reputation of classic King trombones among generations of jazz and commercial musicians.
Overall, this is a clean, honest early 1970's King 3BF that remains ready for continued performance use and includes its original King case.
Condition Summary
Early 1970's production
Serial Number 463873
Appears to retain original lacquer
Appears to retain original factory components
Good slide action
Clean inner slide tubes
Water key functioning properly
Rotary valve operates smoothly
Linkage remains solid and responsive
No significant dents or dings observed during inspection
No visible evidence of prior bell damage or major repair work
Minor indentation present on lower valve-section knuckle
Original King case included
Ready to play
Specifications
Manufacturer: King
Model: 3BF Concert
Bore Size: .508"
Bell Diameter: 8"
Bell Material: Yellow Brass
Slide Material: Nickel Silver
End Crook: Yellow Brass
F Attachment: Traditional Rotary Valve
Finish: Lacquer
Serial Number: 463873
Case: Original King Case Included
Mouthpiece: Not Included
Player Perspective
The King 3BF remains one of the most respected medium-bore F-attachment trombones ever produced. Combining the nimble response of the King 3B platform with the versatility of an F-attachment, the model has remained a favorite among jazz performers, commercial musicians, educators, and serious amateur players for decades.
Many players appreciate the 3BF for its ability to bridge multiple playing environments. It is equally comfortable in big band settings, commercial work, community ensembles, church performance, and a variety of small-group applications.
This particular example exhibits the sweet King center of sound that many players immediately recognize. The instrument speaks easily, projects efficiently, and maintains the lively response associated with classic American King trombones.
Players familiar with legendary jazz trombonist J.J. Johnson will recognize the type of tonal focus and clarity that helped make King trombones a preferred choice among generations of professional performers.
Questions Players Often Ask
Is this a good instrument for jazz and commercial playing?
Yes. The King 3BF has long been a popular choice among jazz, commercial, studio, and big band players seeking a responsive medium-bore instrument with the added flexibility of an F-attachment.
Does the dent near the valve section affect playability?
No. The small indentation observed near the lower valve-section knuckle does not negatively affect the instrument's playing characteristics.
Does the instrument appear to retain its original lacquer?
Based upon our inspection, the instrument appears to retain its original lacquer finish.
Is the original case included?
Yes. The original King case accompanies the instrument.
Is a mouthpiece included?
No. A mouthpiece is not included with this instrument.
What mouthpiece works best in a King 3BF?
The King 3BF utilizes a standard small shank trombone mouthpiece receiver. Any properly fitting small shank mouthpiece will work with this instrument. Our experience has shown that mouthpieces ranging from smaller commercial and jazz cups through approximately a Bach 6½AL size often represent an excellent match for the King 3BF design. These combinations tend to complement the instrument's quick response, flexibility, and characteristic King center of sound.
That said, mouthpiece selection remains highly personal, and many players successfully use larger small-shank mouthpieces depending upon their individual playing style and tonal preferences.
Fulfillment & Ordering
This King 3BF Concert Trombone may be ordered directly through the secure checkout on The Brass Exchange website.
Orders are typically processed and shipped within 1–2 business days following payment approval. Each instrument is professionally packed and shipped via FedEx.
Once your order has been approved, an email confirmation will be sent with additional order and shipping information.
Customers preferring personal assistance may also place an order by telephone during normal business hours.
📌 Next Steps & Collector Insight
If this King 3BF is the type of instrument you're drawn to, it's worth spending time exploring how these trombones evolved throughout the King production years. While the core design remained remarkably successful, subtle differences in construction, response, finish, and playing characteristics can make each example unique.
Interested in exploring more historical King trombones? Visit our Archive of Sold Instruments to compare models, production eras, specifications, and condition profiles from previously sold King trombones offered through The Brass Exchange.
Considering a trade-in as part of your upgrade? Complete our Trade-In Form. Many players use this process to transition from a student or intermediate instrument into a professional-level setup while reducing their out-of-pocket investment.
