I have assessed this for some time and without doubt this is a genuine Missoni shawl based on my own...
I own one with a similar washing instruction label - the shawl is similar but more rusty colours. I also have a brown and blue check silky sweater with this rather papery looking label too. It is approximately early 1980's.I have had my shawl since then. I think the label has come adrift and been re stitched. the pic does it no favours as it emphasises the restitching.
Missoni DOES sport printed labels and I would suggest looking at it you are looking at just the fibre content label( can you just see through it to the washing symbols?) and the other woven side label is missing from the pics.
It is in a special knit pattern called flame stitch which emulates Venetian flame stitch on tapestries.
It is very typically Missoni's style to use this knit.I have never seen a mass produced vesrion which uses fine shading like this.
They used to have two shawls in my friend's shop like this.They were priced then at £250 and £300 respectively to give a price estimate.That was some time ago- sigh!
Also I have done a little study: Proper flame stitch machines are incredibly rare and Missoni started off his business by buying up a warehouse of antique foulard machines. he made silk and viscose shawls very often. As for mass produced- well Missoni shawls and scarves are multiply produced on a medium scale as in thousands. They are not couture pieces, they are pret a porter.
They are still rare as they are so costly to produce and I do not think the shawls are made any more....
I have never ever seen a good fake flame stitch , it is quite costly and difficult to reproduce and is usually printed in a very tacky way on horrible jersey. This shawl is clearly woven/knitted in very fine ply silky yarn with rainbow like shifts in shade and hue. Mine is scrumptious.
Also look at the pleating at the points of the shawl- this is hand constructed( like mine) as the fringe is added on having been woven separately.
I have handled several of these shawls and if no one is going to buy this one- where is it?
I love the colours. It's better than mine - bah!
You cannot just go by labels on vintage as it is construction too which gives it away.
Look also at the very fine knit and the shading- it is too multi hued with an overall gold hue for a knock off.It takes time to set up a machine with all these colours, and time to attach a fringe which has a lace border as this seems to have above the fringe.
I would reckon it to be genuine judging from my own collection.
I hope you bought it in the end.