to clear BARCREST MPU4 usually to fit REAR OPENER FRUITS & QUIZZES made during the 1980s with 'pecker' pay tubes.
can not be interchanged with later mpu4 17 pin type nor with mpu5 power units IDEALLY COLLECT ONLY VERY HEAVY / CHEAP
Casings may have light surface rust patches.
these may work fine but stood a while the capacitors may be weakened with age but good for spares or repair - suit collector/restorer.
Buy now price is for TWO UNITS various makes.
collect in person as they are heavy costing high postage ...... and needing substantial box