This is a set of 3 Newfoundland Provisional Issues, SG 144-147. These issues were created to alleviate the stamp shortage that Newfoundland faced in 1918-1920, specifically of the low values 1 Cent, 2 Cents, and 3 Cents.
This lovely trio are all Mint with Original Gum and in Fine/Very Fine Condition. They're valued at L66 in the Stanley Gibbons Catalogue!