The spider-signal is a cool little gadget.
Amazing Spider-Man (Vol. 1) #148
Published: c. June, 1975?
Cover Date: September, 1975
“Jackal, Jackal… Who’s Got the Jackal?”
Writer: Gerry Conway
Artist: Ross Andru
Inker: Mike Esposito and Dave Hunt
Letterer: John Costanza
Colorist: Petra Goldberg