WBLDon,
Nice little gun!
It looks a lot like a friend's Orvis Uplander 28b (maybe late-1980s vintage) to me, and I believe that was a No. 4 Deluxe. And his does not have an articulated trigger, either.
I have an AYA catalog of about that vintage somewhere, I can dig it out if you like. I do recall that the No. 4 Deluxe is illustrated and described in it.
OK, I found the AYA catalog forwarded by Precision Sports, which is not dated, but the envelope is postmarked Jan. 1983. Your gun looks like what is cataloged then as the Model 4-A DELUXE.
