David Clark Headset Model H3332 P/N 12304G-05 (Aviation Headset) It is on it's great condition and it sounds perfectly fine! 

This model H3332 is a dual-ear, over-the-head style headset capable of affording comfort and communication clarity over long periods of time. It utilizes the DC-1A amplified dynamic, noise-cancelling microphone, delivering excellent speech intelligibility, and also includes a gain control for further optimization of the user’s intercom or radio transmissions.

Durable construction and quality components are found throughout the Series 3300 headsets. Comfort features such as the ear seals and head-pad are specifically chosen for exceptional comfort in any temperature or environmental conditions. Noise-attenuating ear cups provide clear isolated reception of the connected parties by either intercom or radio, while effectively protecting the user’s hearing. David Clark created the world’s first noise-attenuating communication headsets, and continue to lead the world in delivering quality communication tools.

• 5-foot extended coil cord with 1/4" TRS plug
• Crisp, clear communication in demanding environments
• Dual-ear, over-the-head style
• Provides isolated reception and exceptional speech intelligibility
• Rugged and reliable
• DC-1A amplified dynamic, noise-canceling microphone provides superior noise-canceling performance
• Hinged wire boom assembly, 280° rotational, for perfect microphone placement on left or right side
• Dynamic earphone elements
• Microphone on/off switch allows hands-free communication
• Adjustable headband spring assembly for a custom fit
• Pivoting stirrup assemblies on both ear cups help ensure a precise fit
• Foam-filled ear seals, durable and comfortable over long hours and in all weather conditions
• Ribbed head-pad assembly provides years of comfort
• Corrosion-proof, chrome plated, headband/stirrup assembly
• Certified Noise Reduction Rating (NRR): 24db - David Clark part 12304G-05

Series H3300 Headsets are designed to provide crisp, clear communications and effective hearing protection in high-noise environments. They are engineered to be compatible with David Clark Series 3100, 3400 and 3800 Intercom Systems and Series 3000 Mobile Radio Adapters.