Mike, this ejector system looks very similar to a DH(E) ser# 149011 that I own.
Here is a link to another thread from 2013 where we were discussing aftermarket ejector systems. My gun, which is very similar to yours is on page 2 of that thread. It has a picture of the ejector hammers and springs under the forearm wood.
I hope to find out someday just who's ejector system this is.
http://parkerguns.org/forums/showthread.php?t=12158