I'm assuming this is a side view of the crispy glued/fastened to the body of the phaser.
That said, it looks like there is a 'crunchy' area at the left and the crispy is de-laminating from the crunchy bit-- like glue giving up.
Above the gap at the left end it looks like the yellow substance has an almost foamy cellular structure. If this was a recent glue job I'd guess Gorilla Glue-- it has that kind of foamy/yellowish/cellular structure. Problem with GG is that it foams up and pushes the two surfaces apart-- you have to apply pressure to keep the surfaces in contact until the glue cures. Assuming this was not 'repaired,' it's probably not Gorilla Glue.
In the 1960s you had 'white glue,' epoxy, rubber cement, Walther's Goo (known to the model railroad community, one description is rubber cement on steroids), contact cement (as in gluing down Formica), model cement (complete with fumes), hide glue (comes as a solid; you heat it up to melt it and apply it hot), white paste (the kind kids eat at school), LePage's Mucilage, casein glue, Pliobond, barge cement, MEK... I'm sure there were others around at that time.
Librarians had glues for books, shoemakers glues for leather and other materials... almost every industry and hobby had/has specialized glues or cements!
Any of them have that yellowish-cellular kind of structure??
I don't know if 'yellow glue' (woodworker's glue) or hot-melt glues existed at that time. Did 2-sides sticky Scotch Tape exist?
Adhesive Tips: http://www.girr.org/girr/tips/tips5/adhesive_tips.html