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>I'm pretty certain that 653 came about well before 853. 653 was the same heat treated stays (and blades?) as 753 with a work hardened version of the 531 main triangle...or something like that. It ended up being a lighter set than 531C but heavier than 753R.
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Reynolds 653 was introduced some time in the late 1980's. Dimensionally the same as Reynolds 531 Pro. Seatstays & chainstays were 753. Forkblades were 531C. Main triangle tubes were of a higher tensile strength than 531, but I forget whether work hardened or heat treated. David Benson Auckland, New Zealand