The wear on that sprocket is not unusual, only if it occurs really quickly. Living in a dry dusty place it was not unusual for me to replace the chain every 3000 miles, and a sprocket(s) every 6000 miles on Bikes above 600cc's. On the lower displacement bikes, these items will last longer, but seeing the age of this Bike and lack of odometer, there is no telling how long it's been. Also, the front sprocket will often wear much faster than the rear as it is much smaller. Remember that when you ride in the dirt, you are providing that chain with fresh abrasive (sand) all the time. Greetings!
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@onnovocks thanks for the feedback. Definitely agree with the unknown milage, front wearing faster and the extra abrasive sandy particle.
Don't think I will be riding this little bike in the dirt after this rebuild :)