I know this question has been asked over and over, but I need help dating my old Raligh Grand Prix. It was my mom's back when she was in college at Northwestern. Now i have it as a fixed commuter to college for me. I have looked on sheldon brown and on this form to see if i can get any information. Its a 10 speed with simplex. It has a mallard heliocentric hub(i think was put on when bike was in spain and my dad was using it in the 80's). I found a number on the bottom of the bottom bracket but it did not match up with any thing sheldon brown has on his site. It also has a number on the rear outside dropout. I looked at the back of the seat post near the top tube where I read they put some numbers but i did not see one.
Here is a link to my site that I have. The pictures arn't the best. I have some more I can upload when i get to my apartment.