The early Westwood’s were in fact rebadged US Dynamarks ( as were the first Atco tractors) . One of the distinguishing features was the rounded, pressed deck, whereas the first Westwood made decks were the angular, fabricated “threepenny “ bit ones. But , before that is used to date Westwood production , I’m reliably informed that early home built Westwood tractors used the rounded Dynamark decks.