This is an 80s Schaller Tremolo pedal, identified by the reference TR68 (or TR316).
 
Manufactured by the renowned German company Schaller, this tremolo has been in production since 1958 and continues to be produced to this day.
 
Known for its classic, tube amp-inspired sound, this German-made tremolo pedal features exceptionally smooth operation with a deep cut that nearly silences the signal before smoothly transitioning back. It offers a speed switch for fast and slow modulation settings, as well as controls for amplitude and frequency. Built with durability and design in mind, this pedal is an excellent addition to any collection.
 
The pedal has undergone several evolutions over the years:
First version: Grey plastic casing
Second version: Black plastic casing with a thin logo
Third version: Black plastic casing with a bold logo
Fourth version: Footswitch button transitioned from plastic to metal
Fifth version: Metal casing with an ON/OFF LED indicator
 
This particular model is the third version from the late 1980s and is in perfect working condition.