|Top: Obtained through-the-mail|
Bottom: Obtained in-person by Mike Sibley in 1999
To date, there has not been any credible evidence of an in-person signature that clearly matches what I have proposed is the secretarial style.
I suspect there will always be a few who do not agree with the theory for various reasons, however, I believe the collecting community in general has accepted these findings. The evidence is pretty stark.