I think this is product R43. It is solid now though.
Vintage Triang R43 Signal Very good working condition
OO/HO Vintage Triang R43 Diecast Single Arm Signal Home / Distant
Railway Accessories 8Pcs HOOO Scale LED Signal Lights for Model Trains
TRIANGHORNBY/TRIANG REPLACEMENT PLASTIC/NYLON LOCO MOTOR BRUSH HOLDER XO3/XO4
Vintage Tri-ang R43 signal (round pole) .
Vintage Tri-ang/Hornby R43 HO/OO Gauge HOME signal - see description
