White moulded plastic ceiling rose with black plastic base and separate terminal block..
The inner edge is threaded to fit onto the base section.
This example dates from approxiametly 1980. The flex colours are the modern blue and brown.
Two fixing holes secured it to the ceiling. Holes are the standard 2 inches / 50mm apart.
The recessed area is for the terminals, which unusually are a separate item, rather than being part of the base.
VT MADE IN ENGLAND
PAT PEND, BS67
REG. DES. No. 931025
BM 15139 2
Circuit wiring entered through the rectangular hole and into the terminal strip.
The 2 core flex for the light was intended to be hooked around the small tab on the left side (flex shown on the incorrect side in the photo).