Sony CHF 90 - a 40 year audio cassette - Unboxing a duplicate cassette in 2024.

The Sony CHF 90 audio cassette is a compact cassette tape that was popular for recording and playing back audio. It typically holds up to 90 minutes of music or sound, divided into two sides (45 minutes each). The "CHF" designation often indicates that it’s a type of high-fidelity cassette designed for better sound quality compared to standard tapes.
These cassettes were commonly used in the 1980s and 1990s for music playback and recording before digital formats took over.