I know there's a contact # for White machines but unfortunately I don't remember if it was thru White or possibly Husquvarna (spelling?). If you call with the serial number you can find out the model and when it was made. White made a lot of brown crinkle finish machines over the years so rarity would depend on the model.
Do you have a picture you can post?
That might help those with more knowledge identify your machine.
Rodney