Hi, I have an extensive Don Zimmer collection (
http://www.baseballcardstars.com/zim...ballcards.html). I've researched his wife's autos vs. his own, and have met him twice when he signed autos for me. Your auto looks to be a real Don Zimmer auto. The "D" loop in Don doesn't attach and is narrow, whereas Soot's signed autos have a fuller, rounder D and the loop attaches. Here's an example of a Soot (his wife) signed Zim auto:
Soot acknowledged she signed his thru-the-mail fan requests and even the contracts he received through the mail. She even signed his vintage Topps contract, so it's her facsimile signature on 1955 and 1956 Topps cards, not Don's.