Help identifying a 1980s Shimano 600 road bike Under the bottom bracket is a plastic piece with Raleigh on it. It has mavic ma40 wheels, cinelli handlebars, Shimano 600 2x6 gears, it weighs exactly 10kg (EDIT: without chain, derailleurs and front qr skewer), has shimano 600 brakes, a steel frame and has campagnolo top tube/friction shifters. I cannot see a serial number anywhere on the bike. Thank you for any help.
Harvey

Edit: I'm not just asking what year it is, I would also like to know brand and model if anyone knows since I cannot find a serial number.
Based on the style of lugs and overall frame style, My guess is a 1980 Raleigh Competition or Competition GS. It looks like one that has had the frame stripped and then polished.

Similar to this one seen here: