Sorry but there are no frame or engine numbers .
The receipt shows
Supplied by Blacknell Motors ltd. Nottingham
Selling price £118
Sales tax £ 2.12.6
Part exchange Norton registration OPH 746 £50
£1 deposit balance over 24 months .
The bike belonged to a dear friend who passed away a few years ago he was always talking about it .
It's disappointing that the Vincent isn't still on the road .
I think I will try to contact the registration district archives who issued the MNK prefix to carry out research there's a slim chance that the frame or engine number will appear in records .
Norman