Went to a gun store yesterday, and saw a 2-band conversion. The breach block was dated 1866, the lock plate was 1864. It looked about as long as a standard 45-70, and had two barrel bands. Where there may have been a barrel band there was a hole for the barrel band spring, but no notch cutout. The stock looked sanded, no cartouches. No serial numbers but a couple of eagle heads on the metal. Two-click tumbler, spring on the firing pin, no catch on the cleaning rod, which looked correct for a 50-70. Everything appeared to be in the white (including the cleaning rod). The bore was toast, heavy pitting and just a hint of rifling. I know that this could be a Bannerman and I have Dick's book on the .58 and .50 rifles of the Springfield Armory but my knowledge of the 50-70s is pretty much limited to the Model 1868 (which I have one). The store was asking $599 which, given the condition of the barrel I thought was high, but on the off chance I go by there again, what should I be looking for to determine if this is, indeed, a legitimate Springfield rifle?