Anglo/Tigernuts/John---many thanks for your responses
For anyone who is interested this is where I have got to:
a)MCA P110/66 and MCA 110/77
The 110 range are clutch extractors.
They include the equivalents of:
-- 60-1861 for Triumph 500/650s
-- 61-7014 for Triumph T140 (external thread 1" X 20 tpi)
-- DA50/1 for BSA/Norton/Triumph
-- 61-3766 for BSA A65 from 1966.
The suffices at the end of the 110 designation are the differentiators I think for the different applications.
However I cant find any reference listing to say what suffix is for which application.
b) MCA P155
60-2213 Cam wheel extractor for Triumph twins
c) MCA P158
61-6019 Crankshaft pinion extractor for Triumph 350/500/650/750
d) MCA P189
Rocker spindle extractor for Norton Commando
Still no idea after extensive searching for K&N T-101 so have to conclude that it is a "private" stamping.
Will post a photo and see if anyone recognizes it.
Thanks again for the help to date.
Last edited by Tridentman; 01/14/20 2:07 pm.