Hi Marcus,
It's a 9th Foot badge and all I can really say in terms of when it was worn is that it pre-dates the Cardwell reforms when the 9th became the Norfolk Regt. At this time the lion at Britannia's feet was dropped from the design in badges / helmet plates. It's likely to be 1870's or very early 1880's, but the 9th were wearing these type of Britannia badges before then aswell so it could be earlier.
Likely to have been worn on some kind of officers peaked cap. It is not a glengarry badge.
Paul
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