Research: https://www.christies.com/lot/lot-robert-furber-1674-1756-publisher-3822631/? Furber's most notable work was Twelve Months of Flowers, published in 1730. The book was written as a catalog of plants and seeds, and featured twelve detailed engravings of seasonal plants in bloom.
These painting by Robert Furber were purchased in the USA.
Thank you for contacting Mearto with your appraisal inquiry. So that I may best assist you, can you please upload a zoomed in picture of the lower left edge of one of your engravings.