This set of collar badges are done in gilt brass and with white metal “Inniskilling” castles. The castles have their flags flying to the right, so this would date the set to the post 1927 era.
This pair of badges are identical and in what I’d consider outstanding condition. The brass retains a lovely strong gold/gilt colour.
To the revere both badges have sweat holes which assist in the securing of the white metal castles.