From the Weber website:
For late 50’s and early 60’s amps (Bassman, Concert, etc.) using AlNiCo 10’s. Replacement for Chicago Jensen P10Q in all Fender applications.
10″, 11oz AlNiCo plug magnet, 30 watt, 1-1/4″ voice coil, seamed cone. Weight: 5.35 lbs, Diameter: 10.19″, Depth: 4.75″ no cover, 5.375″ with cover, Cutout size: 8.75″
Bright, punchy, later/smooth breakup, aggressive, articulate, compressed/fattened at high volume. The favorite for late 50’s tweed amps such as Super, Bandmaster, Bassman, etc.
Any questions, don't hesitate to ask. Thanks for looking.