Sam Hammond was a prominent jeweler who was known in New York City as the "Watchmaker to Wall Street." His business was located at 44 Exchange St.

Arthur Paul Walsh was one of the leading makers of fine watches in Britain in the second half of the 19th century. He was located at 5 George Street, Euston Road, London.

Hammond sold only high end watches to his prominent New York clients. He purchased goods in both Switzerland and Great Britain and he may have had some work commissioned locally.

The English watches by Walsh may be the highest volume product that he sold and when one is holding a fine Walsh pocket chronometer with a duo-in-uno hairspring it is easy to second the suggestion repeated in Major Chamberlain's book that Walsh was the "Prince of Chronometer Makers."