Neighbourhood Watch!!

I've seen a few of these old signs around. I wonder what vintage they are?

From wander: Clifton Sinkhole, Camp Road and a Re-Visited Fire Hydrant
Taken: Sun 27 December 2020 13:35
Rating: ★★

GPS Coordinates: 51.45810, -2.62294
Location: Clifton Down

Neighbourhood Watch!!
I've seen a few of these old signs around. I wonder what vintage they are?