Ancient window lock key needed

[NDA]

I have a couple of elderly windows that have ancient Chubb locks fitted.... anyone know where I might get a key for such a lock?

[Mr Pointy]

An ebay search shows a number of vendors but it seems there are 12 different versions of that key so you might have to try a few.
https://www.ebay.co.uk/sch/i.html?_from=R40&_t...

https://www.ebay.co.uk/itm/Chubb-Yale-Union-Window...

https://www.ebay.co.uk/itm/CHUBB-NICKEL-REPLACEMEN...

[NDA]

Thanks - that's a great place to start...