Re: T. Dunlap - who was he in relation to Coin or Sterling mfg.
Thomas Dunlap (1822-1892)was a silversmith working in New Hampshire from 1850 to 1888. He worked in partnership with other silversmiths for most of his career. Since the mark you are looking for is T. Dunlap, it might be assumed that these items were made after 1884.
This information was gleaned from information researched by William Erik Voss.