Old parts Query

Today I was given a crate of Supposed "Twenty " parts , When I opened it, not a "Twenty" part to be seen ,The 4 Pistons were about 4.825 " 2 Comp. rings and 1 Oil, a Heavy Champer on Piston top and 4 bolt Big end and a few Parts had Holt type numbering, like 21923 also some carb. bits , and its base is Ensign L6T , definitely not 2 Ton , Could it 5 Ton ?? To My knowledge only a Hand full of 5 Tons ever came out here . Any suggestions anyone ?? LJ