It would be astonishing to get a match in the brown tone, but you can have a beautiful matching appearance of the 'glass weave if the rod turns out to be Conolon. Lot to lot variations alone, even at the time, would result in some variation in the brownish tone. Now add half a century or so, plus removing a baked on finish.
But you can get very close so as not to be noticeable in natural light, especially if an amber-hued spar varnish is used. The outcome on a refinished tip will appear to match with depth and character.
This is not to create a rod represented as a Cummings original and no reputable hobbyist or shop would represent it that way. A beautiful, traditional fiberglass fly rod to fish would be the outcome.
Someone with a bunch of 8 1/2' Conolons--again, assuming that's the right i.d.--will be able to get quite close. It doesn't matter what ferrule was fitted since a comparable set can be fitted if the original female is not re-usable on a newly made tip section. I don't know if it's work Mark M would take on, but someone who can spot Conolon blanks can measure up tips as to wall thickness, tip diameter, ferrule diameter and so on, as well as observe its flex profile relative to the broken section. A similar if not identical one--but almost certainly of identical tip diameter and pretty-darn-close diamter at the ferrule--could be found.
Whether it's worth it to have a quality builder like Mark M do it is up to you. It would be an irresistible hobby project.
Take a look here (and search Garcia and Conolon further in the rodbuilding section) for the general appearance of a stripped and varnished Conolon blank.
Along with pics of a refinish outcome, this thread has a lot of pics of a known Conolon blank that might help an experienced builder see telltales that confirm or eliminate the Conolon identification.
viewtopic.php?f=6&t=16547&hilit=another+Conolon