The dials with split or continuous horizontal year dates are for the most part American machines. Note, however, that the Barry circle postmark could have been used as a service marking. The service markings from these machines include a wide variety, from 'Train Late' to various 'Received' designs.
There is a bit more information available about these machines on my Machine Web page.
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Updated Sun Feb 24 10:13:17 MST 2019