Hello Alan
Your button would appear to be for the 37th (North Hampshire) Regiment of Foot. It looks to have a rim which would make it a tunic button for the period 1855-1881. It is difficult to tell whether it is officer or other ranks quality, I suspect other ranks which would reduce the period of use to 1855-1872 when other ranks stopped using regimental pattern buttons and used a 'General Service' pattern - the Royal arms.
That said, the pattern you have - a crown over 37 within a circle (or so it appears to me) - is not the usual pattern of button associated with the 37th at this time. It was usually a crown over 37 within a laurel wreath. I may well have missed something obvious here, so hopefully some other member will pop along to add their bit!
Roger
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