Great cartridges, I had the Jubilee from this series, I think the B equates to the Cadenza Blue which is the nicest I've heard of the Cadenza series that followed it.
Ortofon have a few available in their 'treasure trove' of refurbished trade-ins - slightly too high compliance for my setup but ideal for many https://www.ortofon.com/mc-kontrapun...d-p-668-n-3450