Matt,
I'm intrigued by the dial plate on your phone. With that d- shaped mark above the finger stop, it appears to be the type that fits the #6 dial specifically-- it can't be used on the #2-5 dials. I haven't seen many, and all the ones I either have or have had still have the Z inside the last finger port. I've seen a picture of one like yours before(maybe here?), but I haven't "held one in my hand". Would love to know what date is stamped on yours.