Using the link on the WKC Home Page for vintage Weber Catalogs, 1962 is the first catalog listed. In it, the 22" black model is pictured and called "The Texan".http://weberkettleclub.com/weber-catalogs/1962-Weber-catalog.pdfWeber was still using nicknames for their kettles in the 1974 catalog. http://weberkettleclub.com/i/1974-weber-pricelist.pdfThe next catalog in the index is 1979 and the nicknames no longer appear in the catalog. http://weberkettleclub.com/weber-catalogs/1979-weber-catalog.pdfI would think as long as a kettle is a 22" size, black and has a MBH, it would be considered a "Texan". The year spread would be from at least 1962 thru 1980(B Code). @Craig - The WKC Historian might be able to elaborate more definitively.