They are unique, but not really that rare, and they were made in the 50's, not 1911-1920 as stated in the ad.
They take 206x13 needles that aren't very common, but can be found, and have limited sizes.
I like the look of the mint green one more than the black one.
IMO, the price is getting pretty high, considering it is untested, has no power cord, and a shipping charge still needs to be added.