Hello , still going through items and came across 3 of these , I cannot find anything  similar , they have 4 gallons stamped on and badge with name Bowman & Webster fae Aberdeen , and on the lids there are two connections labelled beer on one , and air on other , also one looks like its had heat applied to bottom of,  seems to me like its some sort of beer keg , any info on these will be great .. ta