With 120cm at the relatively low power of 375x --
48" (5/10/18): Beautiful globular cluster with 50 or more stars resolved at 375x. Several streams or chains of stars (many easily visible) extend out of the central region, which is densely packed with faint stars over a bright, mottled background glow. A few dozen very dim stars were constantly sparkling in and out of visibility so it wasn't possible to make a decent star count. A very bright orange field star (mag 7.9 HD 127119) is superimposed in the halo on the eastern side [1.4' ESE of center]. Three additional brighter stars in the halo are on the west and north side [incl. a mag 11.9 star 1.7' NW of center] form a semicircle or crown, partially encircling the halo. The diameter was roughly 4', though the outer halo was scraggly without a distinct edge.
I seem to recall this was a "warm-up" object before dark adaptation, and I'm sure at higher power (at least 610x), the resolution would have been much more extensive.