Thanks for the replies, still stumped, looked up morse"s table and yes there is MT 4 1/2.
Looked at the Jarno but does not tally, Jarno 8 or 9 is the nearest.
The fat end of mine is @ 1.07 inch, Less than no 9 at 1.125 inch
The diameter is not down to 1.0 inch (Jarno 8 fat end) until half way along the taper.
So who knows, that is probably why it looks unused LOL
Phil