There was a Raleigh Banana built in 531c with Shimano 1050 groupset, actually theres been a spat of them on eBay lately. Then of course you may strike gold and find a 753 Banana built for the pro team....
Thinking about it you have to be careful with the Panasonic one too as these were built in hi-ten, 501, 531 & 753.
501 framed Team Corsa (Panasonic) on eBay at this time - 22 mins to run
- if you want something decent but have a tight budget.
Co-founder of a V-CC section, member South Eastern Road Club and owner of - 2005 Bianchi Reparto Corse (modern), 1985 Raleigh SBDU Pro Super, 1984 Raleigh LU Corsa, 1980 Allin Stan Butler Special, 1978 Ron Cooper, 1975 Bill Philbrook tourer, 2 x very early Roberts (mid/late 1960s), 1966 Raleigh Superbe Roadster, 1964 Allin Stan Butler Special Belgique, 1951 Hobbs of Barbican S/C, 1950 Hobbs of Barbican S/C, 1947 Hetchins Super Special, 1908 Centaur Featherweight. 1988 Specialized Stumpjumper.