Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,206
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 had a first year of production LHT, serial number was M4061XXX (I used X for each of the last three numerical digits). I no longer have it, so I can't comment on any other markings.
I am surprised that a frame left the factory without a number. If you posted a photo or a few photos of the complete frame and fork, we might be able to tell if there is anything that makes it look like it is counterfeit.
One of my older bikes has the serial number on the seat tube up by where the seat stays join it. And I had a bike with the serial number on a rear dropout. Maybe the deluxe models had a serial number on a different part of the frame?