An interesting useless fact.
One of the very small differences between Featherweights that were produced in the USA and those produced in Canada and the UK is that the pins that hold the Singer badges in place have different heads.
Featherweights produced in the USA have badge pins that have rounded, smooth heads.
Canadian and UK Singer machines, both 221 and 222K Featherweights, have badge pins that have a fancy rosette pin head.
Like I said, useless, but maybe interesting information for Featherweight junkies.