Sorting through some stuff I have what first looked like a morse taper reducing adaptor.
Inside it has a MT4 dead centre in, when I measured the outside though it didn't match with any taper.
Large OD: 62.00mm Small OD: 56.05mm Length: 98.68mm
My maths puts that at 1.726 degrees. Only used a calliper so measurements might not be dead on.
I thought it might be an adaptor for a proprietary spindle taper but I wouldn't know what lathe it might match without trawling through the entire lathes website. Anyone here think those dimensions look familiar? No use for it myself paperweight aside so would sell it for postage and the cost of a pint or something like that.