Hi Gary
I hope I didn't give the impression that those were my arsenate of lead jars. I was just supplying some information for Al's jar.
I did find out a little when I was researching them. Most of them seem to turn up in Australia and I think they might have been used in sheep dip. The smaller jar seems to sell in the 50 to 75 pound range and the larger one around 100 pounds. I don't think they are rare but certainly harder to find than Oxo tins.
Perhaps one of the Australian members would know more and correct any misinformation I might have posted. I'm always eager to learn more.
Vlad