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@Hovis_Brown
Steel
531 - Managanese/Molybdenum. UTS: 48 - 58 Tsi, 100 - 130 Ksi, 700 - 900 MPa
531SC - Limited edition tubeset used by Trek in 1984
531C - Competition Racing tubeset
531ST - Special Touring tubeset[3]
531OS - Oversize tubeset
631 - Seamless air-hardened heat-treated. UTS: 800-900 MPa, density 7.78 gm/cc
631OS - Oversize tubeset
653 - Following feedback from Eddy Merckx that a pure 753 frame was too harsh for certain stages of the Tour de France, Reynolds produced a 653 tubeset which combined 753 stays with 531 main tubes and forks. The 531 used was a thinner gauge than usual produced specifically for use in the 653 set. Eddy and other riders were very pleased with the result, which combined a light, ultra-stiff and efficient transmission with a more forgiving and comfy ride.
653 Record - Needs information
708 Classic - 708 was a tube set in Reynolds' range in the 80's, supposedly designed for track frames. It has 531 main tubes. These were not butted, but had 8 flats running along the length of the tube. The rear stays would be 753.
725 - Heat-Treated Chromoly. UTS: 1080-1280 MPa, density 7.78gm/cc
725OS - Oversize tubeset
731 - Needs information
731OS - Oversize tubeset
753 - Heat-Treated Manganese/Molybdenum. Essentially 531 made with reduced wall thickness and heat treated to increase tensile strength. UTS: 1080 - 1280 MPa, 70 - 83 Tsi, 157 - 186 Ksi
753OS - Oversize tubeset
853 - Seamless air-hardening heat-treated. UTS: 1250-1400 MPa, density 7.78 gm/cc
853OS - Oversize tubeset
953 - Maraging stainless steel. UTS: 1750-2050 MPa, density 7.8 gm/cc