Hi Mark,
Firman & Sons 153 Strand & 13 Conduit St. probably Dates to around 1836-1837.
Firman, Philip &Sons with the same address dates 1845-1850
Seagrove W. & E. 22&23 Common Hard, Portsea dates 1852-1854.
The Proof mark is from Mole.
Putting this together the manufacturer was the Birmingham Co. Mole sold buy the outfitter Firman and Sons around 1837-1850, with a replaced later scabbard from Seagrove.
Hope this Helps.
Jeff
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