Race/road frames from the 1920s/early 1930s will generally be sized about 3–5cm smaller than a modern frame but with a much longer top tube and shorter stems.
Towards the end of the 1930s larger frame sizes became fashionable – up to 2cm larger than a modern frame.
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Many early Trek bottom bracket shells have a one or two letter code stamped separately from the serial number.
This was made by the individual framebuilder to mark his/her work.
Trek frame serial numbers (SNs) are typically stamped into the bottom of the bottom bracket shell.