I think this is the Conrod in question. This particular saw is a red lever, has an open port cylinder, front adjuster and a plastic clutch cover. I'm thinking it's a wood boss. I haven't tried to put a date on it just yet though.
I know the 034 WB got a similar treatment starting in the early 90's with the open port jug, plastic cover and front adjuster. I had one of those in the shop not too long ago.