Here something to keep you going, from IGC:
Name William Smith
Other Names Samuel Smith; Samuel & Charles Smith
Address1 St James's
Address2 St Pancras
Address3 34 Tottenham Court Road
Address4 2 New Lisle Street
Address5 59 Princes Street, Leicester Square
Address6 64 Princes Street, Leicester Square
Address7 18 Oxenden Street, Haymarket
City/Town London
Country United Kingdom
Trade Gun lock maker; gun maker
Other Address
Dates 1792-1875
Notes
William Smith was apprenticed to John Joyner in 1766 and turned over to William Shepherd in 1771. He was recorded as a gun lock maker in St James's in 1792, and St Pancras in 1800.
In 1805 (some reports say 1801 but this has not been confirmed) he established a business at 34 Tottenham Court Road and traded as a gun maker. In 1806 the firm moved to 2 New Lisle Street. On 28 July 1812 he patented an "early quick firing" gun lock (No. 3588) which incorporated a convex hammer face. In 1817 he was appointed Gunmaker-in-Ordinary to the Prince Regent and moved to 59 Princes Street, Leicester Square. In 1820 when the Prince Regent became King George IV he was appointed Gunmaker-in-Ordinary and the following year moved to 64 Princes Street. By this time he had been appointed Gunmaker to the Emperor of Russia and the King of Bavaria. In 1825 (some reports say 1823) William was succeeded by his son Samuel (1794-1855) and the name of the firm changed to Samuel Smith (some reports say Samuel Smith & Co). On 7 August 1830 Samuel patented a percussion cap and nipple named the "Imperial" (No. 5978). This cap was larger than normal and the hammer had interchangeable hammer noses to fit different sizes of nipple which were short and flat the intention being to place the primer close to the powder charge. Samuel claimed the invention made it "impossible to clog or miss-fire". In 1831 Samuel submitted a percussion musket to the Board of Ordnance but it was rejected. In 1834 Samuel's brother, Charles, joined him and the firm became Samuel & Charles Smith. Between 1835 and 1837 they were appointed Gun Makers to His Majesty (William IV) and the Duke of Gloucester. The firm continued to make flintlock guns until about 1850. In 1855 Samuel died. Presumably Charles had predeceased him because Samuel's two sons, also Samuel and Charles, took over the firm.
On 11 April 1867 Samuel (Jnr) patented a snap action breech-loader (No. 1075) with a single bite and sliding bolt. Half-cocking the right hammer withdrew the bolt. Although the specification is incomplete, it seems that an extension on the right hand tumbler withdrew the bolt but disengaged on firing. It may be that none of this type of action were made. In 1870 the firm moved to 18 Oxenden Street, Haymarket, Samuel and Charles occupied these premises until 1875 when the firm closed down and the brothers appear to have emigrated to Australia.
Or:
Name William Smith
Address1 Potters Lane, Aston Park
City/Town Birmingham
Country United Kingdom
Trade Gun maker
Other Address
Dates 1873-1875
Or:
Name William Smith
Address1 110 Lancaster Street
City/Town Birmingham
Country United Kingdom
Trade Gun & pistol maker
Other Address
Dates 1846-1886
What do the proof marks tell you - London or Birmingham?
Tim