William Herschel discovered NGC 6129 = H III-891 on 30 May 1791 (sweep 1015) and recorded "eF, vS, R, lbM. 300 confirmed it with great ease." His position is accurate.

400/500mm - 17.5" (6/27/87): faint, very small, slightly elongated, weak concentration.

600/800mm - 24" (7/22/14): fairly faint, fairly small, round, 24" diameter, weak concentration. Forms a pair (similar redshift) with CGCG 196-047 2.0' NW. The companion appeared faint, small, round, 18" diameter, low surface brightness.

Notes by Steve Gottlieb