There's nothing especially unusual about this being effectively just a repaint with a (probably) Dutch liner; the Verblifa production did not start until 1953, and before that the Dutch more or less used whatever they could get, including British Mk2, 3 and 4 helmets. It is reasonable to suppose that the helmet might have been relined as needed through wear, but not given a new chinstrap because there was no need for one. It might have remained in service or reserve stock for many years.
Interesting helmet. Ought to keep an eye open for one of these myself. I'm rather interested in the postwar European helmets altogether. Some of them are quite difficult to find.