If pressed I would say post WW2. The Pembroke Yeomanry wore the bi-metal badge with the white metal scroll in WW1. They then wore RA after conversion and in WW2. In the 1950's 102 Regt RA readopted the Yeo badge and a version was made in a/a but his time with a gold a/a scroll.
The large number of copy bagdes tend to have a brass scroll.
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