Although the postcard-back exhibits were produced over several years, the Foxx and Grove examples in question could not have been produced until after 1927 based on the uniforms, since these are large-size cards it is possibe to make that determination without needing Net 54 experts to agree with me.
I am not necessarily doubting that the W560 series was produced later than 1927 but am not sure what the exact date is.
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