Vintage Beehive Group II photograph of Gordie Howe

[Barb P.]

Hi,  I have a Beehive Group II photograph of Gordie Howe.  The photo itself is in great condition but there are some tape marks so I think it must have been in a frame and then removed.  There is some "doodling" of lines on the back and there is a signature which says Best regards, Gordon Howe.  How do I authenticate this signature and how does one place a value on this item?  I also have a Beehive Group II photograph of Henri Richard but the actual name on the front of the photograph is Pocket Richard.  Any help would be so much appreciated.

Barb