Image from the Digital Sky Survey. Don't let the dim magnitude fool you. There is a three magnitude difference here between visual magnitude, and the photographic magnitudes given here. 10-13, but the brightest ones slightly more than mag. It contains stars of mags.
Some observers see dark lanes with larger instruments.
We now call it a loose globular. He also describes a bar of 8-10 stars across the center of the cluster. It is actually rather star poor for a globular. The cluster shines through some faint nebulosity that centers on Antares. A poor cousin to M4, it is quite different, being far more condensed.