This is probably the Isaac Willis who appears on the 1861 census, living at 119, New Bond Street, London. Born at Kirk Oswald in Cumberland, he was 76 years old at the time of the census. He described himself as a ‘Music Seller and Publisher.’ Also present were two unmarried daughters, Dinah, aged 41, and Rosa, aged 37, and a general servant.

At one point in his career he was based in Dublin; he is also listed as a vendor of barrel-organs.

He is probably the same Isaac Willis whose death was registered in Hampstead in the June ¼ of 1869.