WTB Vintage 50 Series Brush

I’m looking for vintage 50 series Simpson brushes (56, 57, 58) with original knots and preferably butterscotch handles, but also willing to consider Somerset era. I don’t mind if they are Simpson labelled or made by Simpson for a third party (as the butterscotch 56 pieces I have seen tend to be).

Fairly specific request, I know, but if anyone has a piece they’re looking to part with, let me know! We can discuss prices or possible trades for other vintage Simpson brushes.