OD - VERY GOOD- all original parts; none to 30% original finish; original metal surfaces smooth with all edges sharp; clear lettering, numerals and design on metal; wood slightly scratched or bruised.
WW - WOOD IS WORSE FOR THE PERCENT FINISH RATING GIVEN
OF - FAIR- some major parts replaced; minor replacement parts may be required; metal rusted, may be lightly pitted all over, vigorously cleaned; rounded edges of metal and wood; principal lettering, numerals and design on metal partly obliterated; wood scratched, bruised, cracked or repaired where broken; in fair working order or can be easily repaired and placed in working order.
NPRF - NON-PROFESSIONALLY REFINISHED/COLD BLUE, ETC.
Manufactured c. 1860s-1890.