Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,177
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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I do not recall when Surly redesigned their frame to use straight seatstays instead of tapered, the tapered also had two bends. I am sure there were other changes, but those were the changes I noticed when I put my bike next to another new one several years ago.
Also, more recently Surly added a couple extra brazeons on the fork crown, I think for rack mounting, but I am unsure when that was.
My LHT is from first year of production, I stopped trying to keep track of what they did when, sorry I was not much help.