Mystery solved!
Amazing Spider-Man (Vol. 1) #143
Published: c. January, 1975?
Cover Date: April, 1975
“…And the Wind Cries: Cyclone!”
Writer: Gerry Conway
Artist: Ross Andru
Inker: Frank Giacoia and Dave Hunt
Letterer: Artie Simek
Colorist: Janice Cohen
At first I thought Robbie was speaking in the last panel.
Is this issue the one where Peter kisses MJ before getting on his flight? If so then Robbie’s presence here is perfectly fine for his “Aw, yeah!” expression when looking at them kiss.
I’m still trying to figure out if she meant that as a compliment or a mild burn! Yeah, Hornacek, he is a bit of a third wheel there!
I love Robbie photobombing (panelbombing?) in the last panel.