There are 2 titles associated with this firm.

@book{ wphp_14481
  author={Hatton,Edward},
  year={1765},
  title={The Irish comes commercii, or Trader's-Companion. Containing exact and useful tables, shewing the value of any quantity of goods or wares ready cast up, more adapated to merchants use, than any other extant. Calculated mostly by Edward Hatton, Gent. To which are prefixed, The new table of coin, as the same was made current by the Lords Justices proclamation, since the 8th day of July, 1751: and a table of the number of yards in the several scores of linen, from 1 to 150. These last calculated originally, and the whole book cast up in manuscript, and corrected at the press, by John Watson, Bookseller.},
  publisher={William Smith and Son \& John Watson I and Son \& Alexander Ewing \& },
  address={Dublin},    }
@book{ wphp_14480
  author={Hatton,Edward},
  year={1765},
  title={The Irish comes commercii, or, Trader's-Companion. Containing I. Exact and useful tables, shewing the value of any quantity of goods or wares ready cast up, more adapted to merchants use, than any other extant. Calculated mostly by Edward Hatton, Gent. II. Tables of exchange. In two parts. 1. English money exchanged into Irish. 2. Irish money exchanged into English. Each by addition only, for any sum from 300 pounds to 1 penny, and at the several rates, whether quarters or eighths, from five per cent. to eleven per cent. With the appendix of exchange at par. III. Table of commission at the several rates mostly used in Ireland. IV. An index to interest. Containing tables of simple interest, at 4, 5, and 6 per cent. from 1 day to 30 days, for 40, 50, 60, 70, 80, 90 days; for 3, 6, and 9 months; and for 1 year. To which is preixed, the new table of coin, as [...] by the Lords Justices proclamation from the [...] day of July, 1751. [...] table of the number of yards in the [...] of linen, from 1 to 150. The tables of exchange, commission, and coin, [...] up to Manuscript [...] corrected at the press, by John Watson, bookseller. The fifth edition.},
  publisher={William Smith and Son \& Alexander Ewing \& John Watson I and Son \& },
  address={Dublin},    }