On 10/11/2023, Mark Wellard in Australia wrote:
"The attached picture shows the radio that was in my twin cam, parked in 1966. I think the tires were also the same brand, so it must have been an aftermarket supplier in the USA". -- Mark

"ALLSTATE" was a registered trade name of Sears, Robuck and Co in the USA. Many aftermarker auto parts were branded as ALLSTATE parts, like tires, hoses, belts, shock absorbers, radio, luggage trailer, motor scooter.