Albert Marth discovered NGC 5537 = m 274 on 8 May 1864 and noted "eeF, S, lE." His position is accurate.
400/500mm - 17.5" (5/10/91): very faint, small, oval 3:2 ~N-S, low even surface brightness. A mag 13.5 star is just off the SW edge 1.3' from center.
Notes by Steve Gottlieb