Here is a pic from 1983 where I'm in a competition with my woods ported Jonsered 630.
Look close and you can see the worlds very first Oregon PowerMatch bar prototype. Also under the sprocket cover is Oregon's very first radial ported rim sprocket prototype. I field tested these on the job for Omark at the time. The silver grinding area on the nose is where their laser etched I.D. number is
Willard.