In a nutshell

The Sennheiser HMD 25-1 headset with microphone is designed on the same pattern as the HD-25, but its acoustic characteristics are inferior, with 600 ohm impedance for each phone. It can provide sound pressure level of 102 dB, with total harmonic distortion lower than 1%. Its response curve is reduced for high frequencies and goes from 20 Hz to 16 kHz
The supercardioid microphone is perfectly suitable for an intercom system, with 1 mV/Pa sensitivity and reduced response curve from 100 Hz to 16 kHz.

So the proper use of this headset is more in an intercom system than for genuine sound recording.

This product is commonly named:

Sennheiser HDM 25, Sennheiser HDM25, Sennheiser HDM-25, HDM 25, HDM25, HDM-25, Sennheiser HDM 25-1, Sennheiser HDM25-1, Sennheiser HDM-25-1, HDM 25-1, HDM25-1, HDM-25-1, Sennheiser HDM 25 1, Sennheiser HDM25 1, Sennheiser HDM-25 1, HDM 25 1, HDM25 1, HDM-25 1

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