Thanks Ice. The signatures are of the developers. If I recall correctly (and I definitely need to think more and check on it) but the No 19 sig is Marisa No 19, who I think was also involved with Falcon 3. Too much time has passed for me to go off just memory though.
edit:
[It is Marisa No.19 Ong. On 07/18/93 She announced via Prodigy BBS F3 Group (Games BB) of a new improved Spectrum Holobyte BBS # 510-522-XXXX She was with Falcon 3, and later Falcon 4.]
I found some old BBS printer paper detailing this announcement.
Better get your DOS updated to 5.0 to rock Falcon 3
If anybody can recognize a signature please say who it is and what they did in the building of Falcon 4.
That I would really love to learn one day.
Hey Ice, check out the Smoking Joe sig! Lower left corner in white ink.