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I'm pretty sure the only way to check if you have an SP or an early Roche replica is to look at the injectors,all SPs had twin injectors per body.
Strada's and the American SPO had one injector per body.
the SP2/3 came with alloy tanks,SP3 with carbon fibre and the SP4/5 with steel tanks.
also the SP2 came with low level pipes,the SPS had carbon fairing and the radiator fan removed to save weight.
is yours an early white frame and wheels model?
hope this helps
ian |