My somewhat educated guess is Spirocore solo gauge.
Bel Canto solo gauge. The tailpiece silks look more orange than red to me.
Thanks for your input. I agree there's something very sprio-esque about them (the red tail piece silks looks like theirs) but I saw a video of Odon Racz reviewing his much loved Belcanto solos - and they were red both at the tailpiece & the peg box - so I'm guessing they might be regular Belcanto Orchestra's.Bel Canto solo gauge. The tailpiece silks look more orange than red to me.