Hi Jerry,
to look at the pictures it looks nice, however if we consider it was repainted in the postwar period there would be nothing strange that on that occasion the liner was replaced, it would still be a nice helmet.
For my modest experience, however I confirm what you say, I have often seen late production liners on which only the first three digits of the year appear, a recurring case are those of the CCL manufacturer, for example this I photographed on a Mk3 in my collection:
Regards
Roberto
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