This 1935 Nippy has a May ’37 axle.
Marked 8 over 42 – so it is a 5.25, which ties with specification information.
It has an ‘S’ mark where the Gould book suggests they may occur.
So what, other than perhaps a different filler plug, differentiates an ‘S’ marked rear axle fitted to the Nippies from the 5.25 fitted to Rubies of the same period?
Can anyone throw any light?