I am trying to identify a taper on a drive centre and it does not appear to
be a Morse taper. The dimensions I have are as follows:

Length of taper 40mm (1.575")
Large diameter 12mm (0.472")
Small diameter 10.27mm (0.404")

I measured the diameters as near the end of the taper as I could so please
do not take these measurements as gospel - they are there or thereabouts.

I suspect the taper is metric but I cannot find a source to prove this.

Can anyone offer any help?

Regards, T.