Old Ilford B&W films instruction sheet Pan F, FP3, HP3, HPS

I've been scanning all the little film instruction sheets I have kicking around, for posterity. Here's one with older Ilford B&W films. I don't know my Ilford film history too well, is it possible that the "M.55" document number means it's from 1955?

http://www.backglass.org/duncan/apug/ilford_miniature_films_m55.pdf

Duncan

Seems to have been from before the "great ASA speed change", when listed speeds doubled.

The M.55 is the date code as you assumed Duncan.

ian