Just as the Austin 7 had three wheel studs vs the Morris with 6, but with a larger PCD. The greater irony is that the Austins had slots!
I think early Lotus models had the Morris stud pattern, which was the cause of concern at Le Mans with the first 23 back in 1962 when they had 4-stud wheels at one end and 6-stud at the other. The demand to make them the same led to it having 4-stud wheels all round and the French reaction to that was, "If it needed six before, four is not enough!"
So Chapman went home and never went back again.
But I'm not certain it was the Morris PCD. From memory the Lotus was on a 3.5" PCD.
And while comparing Peugeots, the 203, 403, and 404 commercials (utilities and wagons) had 5-stud on the same 5.5" PCD as a number of pre-war US cars, Ford to 1947, F100 etc, Jeeps, some Japanese 4WDs, Imperials and bigger Chryslers and some of the later Chrysler commercials. With hefty 16mm studs on the Pugs IIRC, too. The 504 and 505 wagons, however, came back to to the same 4-stud pattern that the 504 and 504 sedans wore.
Mind you, there's little rhyme or reason to it all. Some Citroen ID/DS models had just one wheel nut while others have five studs, and these early Peugeots didn't seem to rely on bolts to hold the wheels on at all:
Probably their Bugatti parentage... while your 6-stud pattern adorns this 1922 model:
