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Not 853 but I've got an Aravis Audax in stunning flamboyant red Reynolds 631 that I've been meaning to sell for ages. 52cm (c-to-c) and fits me at 5'9", 30" inside leg. Mostly 10sp Centaur, Chorus 10sp rear mech, Shimano A550 deep drop rim brakes, mavic open pros on Centaur hubs.
It was my original Audax bike (and has done some stupid long rides) bought back in October 2006.
Would happily take £500 for it (sans saddle and subject to me checking it's ok), it's in SW15.
Here's how long I've been half-arsed trying to sell it: https://www.lfgss.com/conversations/227486/
Or, more feasibly, how realistic would it be to find a modern-ish steel bike (rim brake, 10sp+, mechanical, 853 not 4130) for £1000?