Well EPA was no concern for chainsaws back in the 1980-'90s unless you're talking about California. I've made a living running Stihl saws for 28 years and never owned a red switched one. My 1992 066 Mag with dual muffler outlets had lots of balls with it's black master control switch

I do recall some red ones though and if my memory serves me correctly they were on "Wood Boss" units here in Canada.