Giale Nostrale - saving seeds?

[luigiwu]

I need advice on how to save seeds of my Giale Nostrale, a vining squash. Very kind people on here help procure the seeds for me a long time ago and what I have planted this year is the last of them. This variety does not do well in my garden but I feel responsible for making sure it gets out there and perhaps thriving somewhere else so its not lost forever - I hope many of you will take this up when I offer the seeds here

My understanding is to leave the fruit on the vine until it turns brown? Can anyone confirm this? Its already humongous...