Hello Rob
There are several examples of yeomanry regiments continuing to use 'IY' on buttons long after 1908. Some are obvious, in Howard's book, figure 235 'East Riding Yeomanry' is found in a gold anodised version with the letters 'IY'. The Fife and Forfar Yeomanry (fig 68) is another example where a button with 'IY' is found in silver anodised.
I think it likely that your Worcestershire Hussars button falls into this category, the title being used long after it was redundant.
Personally, I have never seen a small version of any of the infamous Gaunt 'blue back' buttons. My understanding has always been that only large versions were produced, all with the familiar 'Gaunt London' backmark.
Roger
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