The cadets were made on a 1867 Navy Rolling Block pistol frame. As mentioned before, it has a perch belly lower profile to the action, and the action top has no rim or ridge at the rear where it meets the grip.
There's a lot of speculation that there's no such thing as an 1867 navy pistol. Some claim it is a modification of the 1865 spur trigger model, still others claim it is a modification of the navy cadet carbine. I know that a lot of them I see are shop made; the story I've heard with them is that remington had a huge surplus of cadet actions, and sold them off to custom builders. Take your pick of the stories to suit what you're trying to sell is what most sellers do.
If yours has the takedown on the front right corner, it isn't an 1867 pistol action but is probably a #4. I've never seen an 1867 takedown. They all had a threaded barrel with the same thread as a blackpowder #1. Bannerman sold a large number of new surplus .50 cadet barrels a few years ago, and I see them installed on #1 actions and chambered for .50-70 quite often.
The other pistol you see very rarely is the 1871 Army pistol, the 1891 target pistol, and the 1901 target pistol. They share their frame with the #7 rolling block rifle. According to Flaydermans, only about 7500 total of the three was made. They have kind of a peak or rim to the top of the frame at the rear where it meets the grip.
I'd hazard a guess that a #4 framed pistol is a custom conversion, as I've never heard of a factory one. I did a quick look through my books to see if anything; but nothing surfaced. But, there's always surprises out there, and I'm definitely not an authority on them!
dave
marlinguy wrote on Jun 1
st, 2011 at 10:53am:
???? Now I'm really confused! Wasn't the Cadet built on the #4 action? From what I've read they were. Either way, this looks like a #4 or Cadet action with takedwon lever and the top tang bent to a pistol grip shape.