Larry,
Im afraid that finding an original replacement blade for your knife is near to impossible. you have to consider that they did not make them that long. Aside fromt hat one in mint shape goes for over a 1,000. If you were even to find a used one, in somewhat decent shape, it still would be at least 400.00, or more.
I did not realize yours is the R1123, trapper. However its still going to hard to find an original balde, if not impossible. Camillus still makes all remingtons modern reproductions, so you still can probably get a blade, but I certainly understand why you would not want to.