Seeking specifications for your Shure Magnetic Phono Cartridge Model: "Super Track Plus" V15 III-B1. Desire, at least, the following: Tracking force; Frequency range; Channel seperation db.
The V15 Type III
Tracking force: 0.75 to 1.25 grams
Frequency range: 10 to 25,000 Hz
Channel seperation db: 28 dB at 1,000 Hz
Mounting hole separation dimensions: 1/2 inch mounting centers
B1 likely means a packaging variation, not a performance difference.
This product has been discontinued since the 1980's. A replacement stylus is still available as the VN35MR. The current model M97xE would be similar in performance.