Assuming there are no other hyacinth beans around for yours to have mixed with, it does sound like a mutation.
You can keep growing it for your own use, of course. You can also give it a name and offer it in the seed exchange forum and other seed exchanges around the world.
You can, of course, try to market it. But it doesn't sound to me like something that would make anyone much money. There are other reasons for marketing things though, and you can do it if you want.
There are many kinds of hyacinth beans in Asia, and it is likely what you have, though unique, is similar to one or more pre-existing varieties.
You could go to the Germplasm Resources iInformation Network (GRIN) and see if there are similar hyacinth beans already in the USDA collection.

Thanks for the info, Walter!

I will visit GRIN and do some research - I knew there had to be a place where that type of information was kept, but I didn't know where to look and my internet searches would only turn up my posts on the GW.
I've started sharing the seeds on the GW seed exchange and will look for others forums with similar goals. I don't want $$ for the seeds, but if they really are a new variety, I'd like to share them with anyone who likes ornamental vines.
I appreciate your knowledge and information ~
Meg :)