This is not the first carved bird signed H. Sloan, Maine that I've found (all, like this one, found in Maine), but I haven't been able to find much of anything about him, and don't have a first name. Clearly he loved his birds though, and I might guess that living in Maine he had a particular affection for the bluebird, which he painted the best deep blue. 1980s or so I would guess and very sweet.
5 11/16" beak to tail; 3 1/8" t. Very good condition.