It's said that Tim replies authentically through Boxing Cat. That said, unless you see it signed in front of you, you can never be absolutely certain.

FWIW, my Tim Allen-signed photo came with a LOA. Never saw that before.:

https://www.flickr.com/photos/45855752@N00/14884669811

And here's the photo that I sent:

https://www.flickr.com/photos/45855752@N00/14227168648

Hi Cameronthom55 :)

Thank you for your feedback {up} Great Success :P

You have been added to the list for the $10 gift certificate.

Tim Allen
Boxing Cat Productions
11500 Hart Street
North Hollywood, CA 91605-6203
USA

{star} [url=http://www.fanmail.biz/46028.html]Tim Allen[/url] on Fanmail.biz | [url=http://www.fanmail.biz/feedback/Tim_Allen.html]Previous Feedback(s) Received[/url]

Fanmail 8)

Hi, I sent a letter and 1 picture to Tim Allen on September 2nd 2015 and received my picture back signed today! I think it's authentic? Or is it secreterial ...

I aske him to personalise it but it turns out he never.

Picture and Envelope:
[img]http://s21.postimg.org/chbn99krr/image.jpg[/img]