[CR]Missing Letter on 1976? Vintage Trek serial number

(Example: History:Ted Ernst)

Date: Wed, 13 Jun 2007 16:44:07 -0700
From: "Eric Brandt" <brazen.cycleworks@gmail.com>
To: classicrendezvous@bikelist.org
Subject: [CR]Missing Letter on 1976? Vintage Trek serial number

I have been pinging folks about my vintage Trek to determine an accurate history. Vintage-Trek.com has serial number info but my Trek is missing the first letter. It is Imron Blue in 25.5 inch size, serial number 5B6B38 with builder's mark H. Head tube badge is glued on, tubing sticker is Ishiwata 022 main tubes, with shop sticker from Vern's in Oshkosh.

Any info would be appreciated to resolve this mystery. I documented pictures on my blog. Brazencycleworks.blogspot.com

Eric Brandt
Gilbert, Arizona