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I know there was a 'C11G' and a C12, but was there a C12G?
The PRS8 switch is listed in the 1955 Lucas catalogue for the C11G, but there's no mention of the C11G in the 1956 Lucas catalogue. http://groups.msn.com/BSAC10C11C12
They may have not been made in 56,
I can confirm that there was not a C12G and the C11G was a 250 cc SV in a Bantem frame