As 4 Devon were TF I don't think they would have worn pagris pre war as they did not leave the UK. They first went to India late 14 and then to Mesopotamia in 1916. I am afraid I can't tell you which version dates to when.
The only other contender for the 4 Devon could date to 4VB rather than 4 TF. Again I have not evidence for this.
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