The Westwood Groundhog machines were introduced in the 1970s. There’s no mention of the groundhogs in 1973, but in autumn 1974 adverts were promoting the ‘NEW’ Westwood Groundhogs. When launched the 3 hp model was advertised at £95.
The date of your GT5 machine could be determined by the code stamped into the cowling on the engine.
The attached advert from 1976 shows that the Groundhog could be had with 3 to 5 hp engines.
A Westwood factory advert from Plympton in 1975 (the factory was brand new at this point) shows a row of Groundhogs in the background.
