The code that should have been used is 9705.00.00 Which has a definition of the following: Collections and collectors' pieces of archaeological, ethnographic, historical, zoological, botanical, mineralogical, anatomical, paleontological or numismatic interest:
This is the code I use all the time and never have a problem.
From the pictures provided, I'll say you have 1871-CC WB-7, Large CC. This is the second use of this obverse die and only use of this reverse die in 1871. It has a rarity of: R4 Very nice coin, I'll say F-12 straight grade.