From my notes with the 12.5" in 2005:
Large, moderately bright, rich in stars, many stars exceedingly faint or unresolved yielding a somewhat hazy appearance, but most are resolved, brighter stars easy, well-detached from background, no particular central condensation,
irregular shape, best magnification 200x. Interesting and beautiful.

The Trumpler classification is II 3 r. My notes show agreement with that.