Lucas components replaced the less reliable Miller electrical system, and better ignition – upgraded to coil and distributor – together with Amal Monobloc carburettors improved starting.

[3] Increasingly affluent customers may have encouraged Vincent to go for a high-end luxury touring model, but at the same time high volume and very affordable small cars were flooding the market.

Vincent's accountants came to the conclusion that the company was losing money on every Black Prince sold, so the last example of both the model and the marque left the production line on Friday, 16 December 1955.

[4] A 1955 Vincent Black Prince set a new auction world record for the model at Bonham's Summer Classic Sale of Motorcycles and Motorcars in June 2014, selling for £91,100.

[5] In 2018, a Vincent Black Lightning, stated to be one of only 19 surviving, set an absolute world record for the highest-price paid for a motorcycle in an auction held by Bonhams at Las Vegas, selling for $US929,000 ($1.16 million Australian).