New to this forum and thought I would toss in my 2 cents worth.
I have 2 Cirrus frames and one Experience Frame and wanted to know that year they where. I emailed RC the serial # and a fellow named Peter got back to me . He said that the third digit in the serial number is the year of manufacture .
So YA0 is 1990
YA1 is 1991
YA2 is 1992
The problem comes when you talk 'made date aka manufacture' and 'model years'
Models often run from August/Sept-ish. So the range given are just from known and identified frames iirc.
Most talk in Model Years as that is how they where sold.
That often we it's said it's either a 1990 or 1991 as without the month it cannot be tied down, if it's a YA0 for example.
Nice to have something concrete though.
Anyway, start a thread and get some pictures up. Dates are just technicalities
RC ? I assume RM ? as in Rocky Mountain. So you can find info from them. Might be useful
SilverFish (UK distributor) seem to say they will with good intentions but never end up getting around to it