Rear Dropout Style
The style of rear dropouts will help you date your frame too. The earliest Ti Serottas did not have the 3D dropouts - up to the late 90's. The earliest Ti 3D dropouts (around the year 2000) had very small holes in the sections that join to the seat stays and chain stays, the later ones (around 2001? and later) have very large holes in those areas.
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