Does cast iron have a coating from the manufacturer?
It depends. Traditionally cast-iron did not come pre-seasoned. 

Lodge, as you know, specializes in pre-seasoned and enameled cast-iron pans. Lodge pans work great, but there isn't anything exceedingly special about their seasoning; it's simply vegetable oil (soy) baked onto the pan. You should be able to achieve a similar seasoning quality at home using the methods described here:

What&#39;s the best way to season a cast iron skillet?

Wagner skillets do not come pre-seasoned from the manufacturer. However, they did typically come with some coating in place to prevent rusting. This coating, while safe, is not intended to be a "seasoning". It wears off over time, and it's role is subsequently filled by proper seasoning.

Update

Based on your photos, that looks to be the coating I described above.