Over the past few months I have noted an explosion of this James Stewart signature style on eBay. It seems as if some sellers have an endless supply of these signatures and they all have the same unusual characteristics.
- A sharp, "jerky" appearance
- Letters smashed together with poor letter definition
- Odd spacing between letters
- Never personalized
- Many of them do not appear to be on glossy photos... they are on cardstock prints
I have consulted with other experienced collectors and autograph industry professionals -- the consensus is these signatures are highly suspect.
Note this suspect style also appears on Harvey sketches.