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The Raycraft Bridge as the advert terms this photocell dates to 1931. Internally it is a selenium cell.

It still works and when illuminated by a bright audio modulated light will produce an output of the modulation that can be amplified and reproduced.

The side view showing the glass tube within the plastic housing.

The 90 mm diameter base with identification sticker.

The encased wide glass tube envelope is 36 mm in diameter, and including the base is 130 mm tall.

References: Article as referenced above. Type Audiovisor was first introduced in 1931. See also 1931 adverts.

Absolute Maximum Operating Conditions^¶