Your example looks a lot closer. I really don't like the 'big loop' 'D', but I was able to find an old facsimile Doerr sig that had it. If the experts don't know of Doerr secretarials, it must be good - there is almost no financial incentive to forge a Doerr and I haven't heard of anyone mailing one of those Burke postcards unless it was a player signing and sending out to a requestor.
Does that close the Doerr on this?