Just dug out my cap and it does have brass buttons on it so unless yours had Rifles buttons sewn on to it then it wouldn't be a LI cap, sorry, I had forgotten that yours had blackened buttons.
I would suspect that yours is RB but just without black braid (very little info out there on undress caps) or it is a VB battalion of a line regt that was dressed in green, which there were a lot of. I can put together a list if needed?
Colin
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