Music publisher and seller, musical instrument maker but it is doubtful whether he made pianos. …
Keyboard instrument maker, Musical instrument seller and organist. C1760 to 1771 in London. Porter Street, Newport Market. Vietor emigrated from London to United States about 1771 and continued making harpsichords and pianos.
An advertisement that appeared in the Public Advertiser on 1st February 1768 was: “To the virtuess (sic) and admirers of music. To be disposed of at reasonable prices. A fine toned upright harpsichord of four stops in mahogany case with four front doors. A neat and well toned perfect David’s Harp with seven pedals. A strong double bass with wheel machines of four strings. A tenor of Jacobus Stainer and two Cremonian of Nicolaus Amaticy, (Nicolaus Amati) of 1664 and 1675. To be seen at Organist Vietor’s in Porter-Street, Newport Market, St. Ann’s Soho, who continues to sell Forte Pianos in different sizes and constructions of which he is the sole inventor, and has had the honour to sell a great many of them within these seven years to the great part of the Nobility and gentry in these kingdoms”.
There is an article about Harman Vietor and his Forte ex Piano that gives more information about the only known surviving Forte Piano made by him while in London. The advertisement above suggests that he may have been making Forte ex Pianos from 1761 before the first Zumpe square piano.