William Herschel discovered NGC 3370 = H II-81 = h750 on 21 Mar 1784 (sweep 181) and noted "pB, pL, not R, r." John Herschel made two observations, first recording on 25 Mar 1827 (sweep 63), "pB; R; bM; r."

300/350mm - 13.1" (1/18/85): moderately bright, fairly weak concentration, elongated 3:2 NNW-SSE. The nucleus is displaced to the west.

Notes by Steve Gottlieb