Earlier in the month, at the M-WTCA meet in Madison, GA, I picked up a Bullard no. 1 quick adjust pipe wrench. While researching prices I ran across a no. 0 on etsy. It looked decent and the price was right so I bought it. I haven't had real good luck buying wrenches online but in this instance all was good.
I don't know how common these are but they are the first two that I have seen. I have since looked at AA and found that Bullard was out of business by 1909, which probably explains the relative rarity.
The no.0 is only 5 1/2 in. long, while the no. 1 is considerably longer. I have it stuck in one of my banana boxes to go to Flywheelers so can't measure it.
Mike