OHW as they are commonly abbreviated as are commonly known as Old Heavyweights or Original Heavyweight depending on who you ask .
These new figures first arrived in the 1961-62 catalogue. Firstly in sets that were rushed out for Christmas 1961, with the individual teams arriving a few months later. These new figures were more realistic and more colourful than the earlier figures, and were clearly more attractive to the youth market but older players did not like them and stuck with the more agile Flat figures.
In addition, unlike the celluloid flat sides, these teams were sold complete in attractive and practical boxes.

The player is wearing a short sleeved shirt with a v-neck, both of which are usually highlighted in the painting (although not always). Eventually it was replaced by the Heavyweight in 1968.

As well as the Main range the OHW had the World Cup 1966 Range as well as the Spanish Production in the 60’s using the OHW figure. I believe thats the only other “Range” that used the Ohw although they also used the Rugby Chunkys….