Ossa
Ossa motorcycles were manufactured in Spain from 1949-1985 in Barcelona, by Manuel Giro and his family.
Ossa's were somewhat unknown in many parts in the 1970s, and are less-known today. Since it has been 19 years since a machine came off the assembly-line, parts, and support can be difficult to find.
Sources of Information
[1] Ossa Planet web site