It might be The WS for yanigisawa metal that would fit. I got the Yani-WS for tenor-TK handcrafted which is a quite slim piece, like yours TW for alto - but have you tried asking Theo Wanne himself?Thank you Sfhansen, I found that too, too bad it doesn't talk about Theo's pieces.
I hope anyone having WS ligatures and TW mpcs can try and leave a record here.![]()