Although it's possible that the 850 came out a year earlier in "the father land" Sweden, that model arrived in the US in the spring of '92 as a '93 model year car. All the owners literature lists it as a '93 here too. I remember those days well as being a tech, we had to go through 2 weeks of school for that car because it was so different from Volvos older RWD models then.
As for the tranny, yours is not really rare lasting that long BUT if you don't flush its fluid soon (if never done before) it won't last much longer. I've seen several early 850s go 140-150K miles w/o ever flushing the ATF but then one day the trans just goes.
In the US, there are still many '93 850s with their original trannies. It's not really as bad of a trans as some seem to think.
Now...............the '99 S80s, that's yet another story and I pitty the owners of those cars who buy one used or try keeping it after the warranty expires. That reman trans sells for about $2K and 15 hours labor (book time).