You may already have seen this manual. It does have a couple of images that might help people identify the Wajax Mark I you are looking for.
http://cfs.nrcan.gc.ca/pubwarehouse/pdfs/23585.pdf
I have no idea what mark of pump they are selling but it might be worth contacting them
http://www.kijiji.ca/v-cars-other/cr...ationFlag=true
And some more folks with an interest in the Mark 1 pumps
http://www.smokstak.com/forum/showthread.php?t=129527 I've found the smokestack forum to have folks with surprisingly varied interests.
I hope I'm not insulting you by telling you things you already knew long ago but a quick google on "wajax fire pump mark 1" produced quite a few hits - something like 4300 - but not all for the Mark 1. Enough for a week of bedtime reading.... enjoy.