Hello everyone, new guy here but I have been a long time Byrne fan.  In the past few days I have read through various threads in here and seen some amazing art I haven't seen before.

I and a few others are involved in project to identify all the art on the 1975 and 1977 Marvel Slurpee cups and we have essentially identified them all except two.  One is the 1977 Iron Fist cup and the other is the 1977 Black Panther cup.  Several of us think that Mr. Byrne might have contributed to the art in the Black Panther cup but since no one can seem to find were the original art appeared we can only theorize.  

Below is a scan of the two parts of the cup joined together so you can get a better view of all the art.  Please let me know if you think this was done by Mr. Byrne and if this art appeared anywhere else besides on the cup.  If you look at the second part of the cup under the tree limb there is what appears to be a signature and date... I am not sure if that is Mr. Byrne's though.  Thank you all in advance for any assistance you can offer.