The Guard Tip [banana nose] came out in 1978, I tested one of the originals too. They were only in the 3 rivet medium contour and slimline contour Oregon bars. The one in my photo was the only banana nose on the PowerMatch bar ever, never was put into production.
Stihl got into hot water over a article they published in Chainsaw Age magazine back in the early 1980s. They stated with a photo that if the banana nose bar was put on the saw upside down kickback would increase greatly. Of course that never was the issue and a few months later Stihl put in another article and apologized and said being put on upside down would not increase kickback energy.
I'll try and dig those two articles up and post them here later.
I believe your right SawTroll Oregon may still list some of the PowerMatch bars with Double Guard tips in some parts of the world , but the consumer laminated ones have basically replaced it.
Willard.