I vote 85, but it's really hard to tell. If you're wondering, I think most (all? some?) mopeds made before 1980 had 7-digit VINs. My '78 Kromag has a 7-digit all-number VIN, just like yours. I don't know if they had a numbering system that went up or down logically as time progressed, but mine's VIN starts with 3. If they did have some sort of logical, chronological ordering to the numbers, yours probably starts with a 3 too since they were made in the same year.