She had bought them in the early 2000s as part of a group of artworks from a sale of the estate of former Liverpool School of Art teacher Mary Morgan Lloyd, who was a friend of the artist.
Recently she discovered the drawings behind another print of a Lowry work that was part of the collection she had bought and decided to sell them.
Unlike his famed drawings of stick-like figures, these drawings, dated 1961, are of a different style.
The collection consists of four pencil drawings on three sheets of paper: a coloured drawing of a woman visiting a cottage; two pencil landscapes on a single sheet; and a pencil drawing of a couple watching a travelling man.
The drawings will be offered at Unique Auctions’ Antiques, Art, Train and Collectors Auction on October 23 with estimates of £20,000 each.