With the help of this great site I think I'm getting a better understanding for what I'm looking for now. I have my eye on a Sievert and was wondering if a full Sievert parts marked stove, slant, smooth neck(no fins) and (type 3)penta fuel cap be narrowed to 1966-69? Did any Sievert marked stoves make it to 1970 or was 1969 the last year they had his markings? Also, has it been concluded yet what year the type 2 Sievert fuel cap was changed to the type 3 penta? Was it 1966 or a bit earlier as I gather?