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jupiz
@jupiz try the link below, which is on the Thorn Cycles forum.
http://thorncyclesforum.co.uk/index.php?topic=6975.0
This thread has links to Wayback machine with a LOT of the archives from Thorn. You'll find the 853 Audax brochure there.
Also have a look around the forum as a couple of the members are into the 853s. I don't think they made the 853's for long, I think maybe two or three years before they changed to their proprietary tubing.
If you don't get anywhere PM I have a copy the PDF for the year of my 853.
Also if the fork is original you Thorn normally stamp the size and style (S=Short or L=Long top tube), e.g. 567L on the steerer tube.
I think there's also a builder's initials on the serial number, from memory LA is Lee Cooper.
I have a list of the builders they used from Thorn's workshop manager, which I'll post later.