Nippy Rear Axle – what does an ‘S’ designate?

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?

2016-06-08 12.06.572016-06-08 12.07.10

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