Extra-rare pre-Alpine export-only item probably meant for the USA-only "100" system (CX-100, MX-100, TX-101, GX-101), the PX-101 was (somewhat) distributed in Europe as well but may have been a specific Luxman USA demand by way (or not) of Luxman EU - Lux is Luxman is complexman.
No high-end here and a none-too-Luxman design but decent specs ; if the motor is a DD DC Servo, the tonearm is belt (wire) driven.
Not to be mistaken with the low-end PX-99 and PX-100 which are normal radial-trackers. But who built the PX-101 for Luxman ?
Micro never went for linear-trackers - out.
Fujiya Audio did make at least the PD272 and PD-284 and made some linear trackers for others so it could be Fujiya... However, the japanese industry being what it was, the 101 came from NEC which at the same time had a model named P580LE which Lux visually redesigned slightly (but cleverly). NEC also made a version of it for SABA under the RSP 450 name (Sigma series, 1981/82), again with a slight visual redesign.
You can see one in action here.