Jaak Vanvelthoven, from Boonen Vanvelthoven Motors in Lommel Belgium, confirmed that they built around 70 BVM bikes at the time.
The first 30 were assembled with original Sprite frames from the UK, the rest with frames made by Wilvo, a metal construction company in Holland.
On many bikes they fitted Husqvarna pistons and cilinders and consequently an adapted exhaust pipe to the left hand side.
One of the famous riders on BVM was Walter Baeten, brother of René Baeten who was the first Belgian World Champion motorcross in 1958.