Chainsaw Repair

I can't say for sure, by just going by memory and not going to the bother of digging up Ipls. There is a possibility they may swap.
 When I retired my 920 I switched to Stihl's 064 when it came out in 1986. When the 288 came out I should have tried it out but I was happy with the 064, I bought 3 of them brand new.
Not till over 20 yrs later I switched exclusively to Husqvarna. Funny thing is I bought one of the very first Stihl 066s in the early 1990s and now I'm running a new 395XP Husky which is actually an older design [394XP] then the 066. Far more advanced saw over the 066.

The 066 actually is a couple of years older than the 394xp, but not on all markets. It came out in 1988 in Europe.   

Depending in what part of North America you were in the Stihl 066 came out in 1991-92. The Husqvarna 394XP..... 1990-91
 The 066 did not come out in 1988 in Europe, because I worked for Stihl Canada as a tech rep in 1989 and even met Hans Peter Stihl personally at the time. There was no mention of a 066 in 1989, only the 064 was on all the tech sheets. In 1990 the 064 "Brain" was available with the red light technology which a year later in 1991 became the larger cc 066 red light.
Come on Niko you should know that.

Well, according to two different Stihl documents I got from a reliable Stihl source, the 066 came out in 1988 (in Germany, not in the US or Canada). He informed me that the documents were from "deep into the Stihl system".

OK then, let us see these documents.