The VT-207 is the US Government specification for the commercial 12AH7GT and both Type designations appear on this valve. It has two independent audio triodes within the envelope. The triodes are low impedance, low gain types similar to the ECC82 in ratings. The anode dissipation is 2.5 Watts per anode.
The Ken-Rad name and Made in USA.
The cement holding the glass to the base cap is augmented by a heat shrink plastic sleeve.
The twin triode sections and the 12AH7 etched into the glass.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 63 mm tall.
References: Data-sheet, 1040 & 1043. Type VT-207 was first introduced in 1941. See also1941 adverts.
