Mike,
According to the ID and Serialization book, you have a Grade 0 hammergun with 32" Twist barrels and capped pistol grip stock. It would have a steel buttplate. You state your barrels are 30", if so they were probably cut down from 32" or the book could be wrong. The 5245 number on the flats would be the order number which is often found on guns in this S/N range. The T with circle around it means Twist and the rib inscription should also say Twist Steel.
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