Remember Osbourn very well from the '60's, they also made HSS lathe tools designated VG always charcoal black colour and very tough, not sure of the spec now although I still have some and they defiantly surpassed "normal" HSS for performance on tough steels.
Another product was T32 drills [ "treatment" maybe? ] these were again superior in performance on tough materials, they were standard jobber drill length but with a short flute length, similar to todays spotting drills, also charcoal grey in colour.
John