Best guess (and based on some research) for me is that the Mastertouch began as the "One Touch Plus" in 1988 (K) through 1991 (N) with an open ash pan and did not get the "gold" style ash bucket until at least 1992 (O) and was made through 1999 (EE). In 2000 (DD) the One Touch Gold was introduced, I remember my Weber rep at the time, Alan (when I worked for The Home Depot in Sept, 2000) at the time told us the "Silver" and "Gold" tiers were new for 2000. That was also the day I found out that Weber was no longer making bright red grills
, but that Maroon was the new "red". Why Weber didnt keep the lid bale and thermometer at least for the OTG is beyond me!?
Craig