Personally Gary I would use eBay, using a seven to ten day auction listing (rather than 'Buy it Now'). Try a couple, setting quite a high starting price, to test the water. You can always bring the price down if they don't sell.
What you have sounds interesting and, if you're a reasonably regular eBay user, you can make use of an 'advanced' facility to see if any similar items have sold in the last few months, and what price they made. If you're not an ebay regular, and are interested in finding out, let me have a bit more detail and I'll do the search for you.
An auction house might be simpler in some ways ( no eBay listings, postage and packing etc) but I'd be very surprised if you make much that way.
Edit. Another option might be to give someone like Pooks of Rothley a ring and just see what they would give you for the whole lot. They trade directly with customers, and on eBay as 'Motoring Magpie'. You could then decide whether the simplicity of one sale, at trade price, is more appealing that doing things yourself on eBay or wherever.
Edited by john winfield, 26 November 2019 - 12:49.