It was essentially the predecessor to Reynolds 531 and was introduced in 1933; it ran alongside 531 right up to WWII. It was available in both butted and plain gauge but its attraction to the French framebulders was for the ultra light Touring Trials frames because it was available in an ultra light version with 22/24g walls on the main tubes together with a 24g head tube Not to be recommended for a long life frame as its strength was not as good as 531 and these gauges are similar to 753.
Hilary Stone, Bristol, England
Jan Heine wrote:
> Reynolds H.M. tubing, from 1936, 3/10 mm - was that straight gauge?
> Or butted? Used in France.