A Shimano 600EX group appears as early as in the June 1978 Shimano catalog but the XT is first shown on the back of the "New 600 EX" of an October 1983 brochure, although with a non-production RD cage. Deore Touring mentioned by Miele Man was in the 1982 Catalog, but that was never called the XT. A Deer Head icon was used on the boxes of this group, but no Deer Head emblem was on the equipment, thus the Deer Head name is given to the XT m700 only. The date of introduction for 600 EX is given as 1983 and 1982 for the XT in the Shimano History page, Should someone inform Shimano? or I am the one confused?