Originally Posted by
T-Mar
Reynolds 453 was the lowest grade of tubing offered by Reynolds in the late 1980s. It had 0.8mm walls with 1.0mm butts. Reynolds didn't bother to list a weight because they only offered the main triangle. However, it would have been slightly heavier than the plain gauge SMS, which was probably the stay and fork material on most 453 frames. SMS had a weight of 2700g compared to 2300g for 501 and 2050g for 531C, so 453 was pretty hefty.
There's a good chance your 453 frame is from Canada.
A review of the data from the Reynolds site, tubing bearing the Reynolds 453 sticker "may" not even be mfg. by Reynolds. Lending support to where it sits on the quality scale as T-Mar pointed out in 2009.