The pic below is a 1987 Raleigh Record. As near as I could tell, the only difference between the 87 Record and the earlier Marathon was the Marathon had dual QRs and a slightly better rear Suntour DR. Otherwise the bikes appear to be identical. The 502, chromoly frame, alloy rims, bars, brakes, levers, cranks are identical along with the chrome seat post.
The bike below has a few minor upgrades. The chrome seat post has been replaced with alloy and I added the rear QR like the Marathon has. For a 1987 bike, this is a bit of a throw back looking more like a 70s bike than a late 80s bike. But meets my needs and has a surprisingly nice ride.