This safety razor is in excellent condition for its age. It is a beautiful vintage, one-piece model (also called butterfly or TTO), made by Gillette in the 1950s.
HD stands for “Heavy Duty”, which is sure is. Ideal for beginners to traditional shaving, but will of course suit the experienced shaver.
Its original case is in worn condition, it has a crack on the front but it closes well. The head of the razor still has some marks left by an old blade, but nothing serious (see pictures). You can shave with this razor without any problem.