I'd say it was Eickhorn. Why? "Christmas" dagger was the 1st SA dagger ever and it was made by Eickhorn.
Which maker is most representative? Well, it's more a matter of taste and personal preferences. I agree with you, Larry, when I hear B�KER, I think automaticaly about an SS dagger, even if the company produced HJ knives and RAD hewers as well. If I had to sell all my M33 SS daggers keeping only one, I'd definitely keep B�KER.
HACO and SA? Well I like HACOs a lot and when I hear HACO I do think about SA dagger, but do I think about HACO when I hear SA dagger? I don't think so. HACO wasn't even producer. To me the most representative for SA will always be good old Eickhorn with a score of 52000 SA daggers produced.