I'm a little confused about what I see. The '73 pictured has a pinned trigger through the frame. I have not seen this before on a '73. Also, the dust cover is riding on a rail. Early '73s, including at least some 1 of 1000's dust covers ride inside 2 grooves.
I doubt if this is that early a deluxe rifle, especially since the serial no. indicates it was made in1880. Most one of one thousand rifles were made before 1877 and were first offered in the 1875 catalog. I dare say all of these rifles were considered deluxe.
J.L.