There are a few different Ertel squats and all of them are very tough to find, scarce. This is the Brown Stout variant. I've only see a couple in the last 40 years. The top is an applied double taper. Iron pontil is in a deep kickup.
Embossed: P. ERTEL / P. E. (script letters) // BROWN / STOUT
Height: 7 1/8"
Color: deep emerald green
Condition: near mint - perfect structurally with no chips or cracks. The collar is intact. The bottle is very clean and hardly any wear except the edges of the base have some unusual wear that looks like someone might have polished out some roughness, but unsure, and no harm. A bubble on the back has a slight ding to it.
Reference Number: GW390