[Healeys] Overdrive ratios

[Michael Salter]

I have 2 BN1 overdrives which I'm struggling to identify.
Unlike the later type "A" units the serial number on these is not prefixed with the ratio.
The serial numbers on these are :
1260/288
and
1292/2037
Anyone with information which would help identify the ratios of these?
Thanks.


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