Built in Severodonetsk, Ukraine by Quantor (НПО "Квантор"), this ZX Spectrum clone arrived at the museum with no documentation. Thanks to online contributors, we now know it’s based on the Kvantor board, likely derived from the popular Leningrad DIY design. It features a 48K/128K mode switch, TR-DOS support, AY sound chip, and multiple DIN connectors for cassette, joystick, and power.

Memory chips are stacked in layers, and the board appears heavily modified with hand-extended circuitry, yet housed in a professionally made case. A hybrid of hobbyist ingenuity and industrial design, it may even be a one-off prototype.