as the Jota was an aftermarket concept from Slater's in the U.K., so was the original Mirage 1200 an aftermarket concept from Slater's.
Slater's took a standard 1200 (roughly 78/79), replaced the mild cams with lumpy 4C's, added a large bore exhaust collector and a pair of Jota silencers, then stuck a yellow 'Mirage" sticker on the side panels. So a Slaters Mirage is a performance modified 1200 from around 78/79 but otherwise looking pretty much like a standard 1200 except for the Jota silencers and the yellow Mirage stickers.
then, Laverda adopted the "Mirage" name for the later 1200's, roughly 80/81, added a handle bar mounted fairing, different bodywork, but tame cams, quiet exhaust, and more mechanically developed. Those have a cast "Mirage" badge, are easily identifiable from the later bodywork, even when the handlebar fairing is removed and tossed as many were, and every one I have ever seen came stock from Laverda in silver, with red pinstriping, and shitty clear coat that turns yellow with age.
as far as I know there are two Slater's 78/79 1200 Mirage's that made it to Canada. I have one, my 79 1200, and the other is in Quebec. I have a copy of the Slater's documentation for the two Canadian imports. There may be a few more here if they have been brought in by private importers from the U.K. over the years.
over the years the lines have gotten blurred, lots of base 78/79 1200's have been fitted with Jota exhaust systems and lumpy cams, so are in "Slater's 1200 Mirage spec".. Same with later TS 1200 Mirage factory models, some are still mild stock, some have been modified, but the later extensive bodywork is very distinctive. Very nice long distance relatively civilzed sport touring bikes, probably the most refined of the 180's.....
Paul LeClair