Thanks all,
That sounds more reasonable, BlueDevil. Interesting. I knew there was no way it could handle 36 on the rear but the meaning of the stamp eluded me. I'll have to do some further searching to see if I can decipher its meaning, just for fun. I'm going to try a 14 - 28 Regina and see what happens, as the chainwheels on this old bike, are, for some reason, huge. 51 & 54 or something like that. Thanks.