King 623 Diplomat Baritone Horn Overview

The King 623 Diplomat is a compact Bb baritone horn designed around a 3/4-size body, an upright bell, and a straightforward three-valve layout. Its manageable format makes it a practical choice for school programs and developing low-brass players who need the traditional role and range of a baritone in a more compact instrument.

King 623 Diplomat Baritone Horn Specifications

• Instrument Type: 3/4-size baritone horn
• Key: Bb
• Bore Size: .562 inches
• Bell: 10-inch upright yellow brass bell
• Valves: Three top-action nickel-plated piston valves
• Finish: Clear lacquer
• Case: King-branded hard case
• Accessories: Bach 6-1/2AL small-shank mouthpiece and Bach Synthetic+ piston valve oil
• Serial Number: 662125

Condition & Setup

This used baritone is in excellent playing order and has been professionally serviced, set up, and play-tested before sale. The clear lacquer finish shows light scratches and scuffs, most notably around the bell flare and interior, along with faint handling marks on some reflective surfaces. The included King hard case shows light exterior rubbing and scuffing, with its handle and latches present.

Who the 623 Diplomat Baritone Horn Is For

The 623 Diplomat is well suited to student musicians, school programs, community ensembles, and players seeking a compact traditional American baritone configuration. Its 3/4-size body is easier to manage than many full-size low-brass instruments, while the upright bell and three top-action valves provide a familiar concert-band layout. Players who specifically need a four-valve euphonium configuration should consider a larger instrument designed for that role.

Common Questions About the King 623

How does the 3/4-size body affect the instrument?

The compact body can provide a more comfortable physical fit for younger or smaller players while retaining the Bb baritone's established ensemble range and function.

How does the King 623 differ from a full-size euphonium?

The King 623 uses a compact 3/4-size body and three-valve baritone layout. Full-size euphoniums are generally larger and frequently add a fourth valve for expanded fingering options in the low register.

What mouthpiece configuration does this instrument use?

This instrument includes a Bach 6-1/2AL small-shank mouthpiece, a familiar low-brass mouthpiece format that is compatible with the supplied receiver.

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