Compare to BOSS PN-2™ from the mid 90’s, using the obsolete dual VCA M5207L01 chip. Dual stacked PCBs, meant to fit inside the 125B enclosure. Comes with 1mm spaced M3 nylon washers, and color-matched mini 3pdt pcb (if available). Link to mini 3pdt pcb.
Can be purchased as pcb set (both pcb’s with mini 3pdt pcb), or the very same bundled with a tested M5207L01 chip.