Yes. By Gleason's last PA Sydell Spear, c. 1970's/80's. Jackie "never" used a dash so far as my research has taken me. Tamino has one for $50. It would be worth $700 easy. These are all over the place.
Are you looking for a Gleason? From what period? The later the signature the less common, although all can be pricey. Most will be album pages from the 50's. Anything else is unusual to one degree or another. Signed photographs are the toughest.