1983 Record Rapid is quite different as the paper contains Cadmium which stabilises it. Tthe paper was modified on the late 1980's to meet stricter pollution laws in the EU (Common Market), the labelling changed at that point, as did the range of image tone/colours achievable wth it. Many other warm tone papers suffered from the removal of the Cadmium.
Originally Posted by Martin Aislabie
Bromide papers keep far better and I've used 1950's materials with mainly just a loss in speed & a little contrast.