Dave,
Parma began producing these chassis and RTR cars fitted with them around 1975, when the supply of other available chassis from Limpach, Neat Things and Associated SS (Gilbert) dried up. These are the most commonly found post-vintage chassis nowadays because Parma made thousands of them.
While John T. may have signed it for someone, it seems frankly doubtful, because that chassis looks like it has seen better days, with virtually all its joints re-soldered and the repairman never bothering to clean his mess afterwards. Also the markings look quite recent compared to the condition of the chassis in general.
Best would be to ask Tore himself, by getting in touch with him though Bryan Warmack right here on Slotblog.