Too bad Bailey's doesn't have any archival written history that I'm aware of. Just a business like many, that kept pushing forward and no one to say 'hey, we ought to put something about our past in each catalog we send out.' My experience with Bailey's in the last ten yrs or so is that the 'old guard' is completely gone. Agonizingly for me, they found a batch of those old Oregon .404 bar tips, with the half-moon three rivet pattern. Sold them all by the time I found out about it. There's also a AS forum member that has a whole bucket of them(saw the pic), but he's like a hoarder from hell and just wanted to trade for them......but never could get him to move on them.
Anybody that worked at Bailey's during the era of the 70E could tell ya if they were ever fitted with full-wraps. I don't know the size if the saw body, but assuming a 80/90 full-wrap won't fit? What about the 621...would a full-wrap from that saw fit?
Pretty much in the PNW, if a saw showed up on a logging site or was used in serious scale production, the dealers were asked if they could get a full-wrap for it.
Kevin