Gregory,
According to the Parker serialization book. Your gun is an 0-grade 12ga lifter with plain twist barrels that was made in 1878. The only thing I see of your gun that doesn't match the book is it lists your gun as having 28" barrels rather than the 26" you mention.
Your gun looks to be in great condition for being 133 years old, How are the bores any pitting?
Hope this helped,
Paul
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