Below are the specifications for the Weaver B4 as listed in the 1958 Weaver catalog and other source materials from the same time period.

Magnification: 4X

Field of View: 30ft

Tube Diameter: 0.750 inches

Eyepiece Diameter: 0.955 inches

Objective Diameter: 0.750 inches

Eye Relief: 2 inches

Length: 11.5 inches

Weight: 6 ounces

Adjustments: 1 MOA friction lock

Crosshair Options: Crosshair

Original MSRP: $9.75 (1956)

Inflation-Adjusted MSRP (2026 dollars): $119.00

Notable Features: friction lock adjustments, achromatic lenses, type N or tip off mount included in the sale price