Dean,
Stunning collection and congratulations on getting hold of what is an incredibly rare group of items.
I'm sure the silver experts on here will be able to confirm details of the hallmark/maker but the timescale you mention would be correct as that pattern of forage cap badge was in use between 1857 and 1863.
Have you looked at Raikes book 'The Third West Yorks Light Infantry'? Let me know and I will send you a copy, there are some drawings of badges in there that may be of use.
Ivan
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