Beijing No. 4 Toy Factory has manufactured a batch of very simple children's cameras since 1976. In order to reduce costs and meet the demand for low-priced children's toys, these cameras use cheap plastic bodies. The crescent-shaped single-piece plastic lens lens only has an aperture of 22, and the simple shutter has two stops: 1/60 second and B door. Using 120 film, you can shoot 16 negatives of 6X4.5 size.

Beijing Toy Factory No. 4 registered the "Gemstone" trademark for this children's camera in October 1976. The author recently purchased the original trademark registration certificate in an old bookstore. From the fact that this registration certificate has been found in used bookstores, it can be seen that Beijing Toy Factory No. 4 no longer exists, and its archives have also been scattered among the public.

The registration certificate was issued by the Beijing Municipal Administration for Industry and Commerce on October 1, 1976, and was stamped with the round official seal of the Beijing Municipal Administration for Industry and Commerce. The red gemstone trademark pattern is also stamped with the steel seal of the Beijing Administration for Industry and Commerce.

We noticed that in addition to children’s cameras, two products, children’s telescopes and hand-cranked movie machines, were added to the product name on this registration certificate in 1978. We can still see many Baoshi brand telescopes manufactured by this factory on the Internet, but we have not found any samples of Baoshi brand hand-cranked movie cameras.

Although this children's camera is so simple, it does not require complicated operations. You can take pictures by pressing the shutter button outdoors in good light. You can shoot with Bulb even when the light is low outdoors or indoors. In China in the 1970s - an era when cameras were far from popular, I believe it would also bring a lot of surprises and joy to those children who were exposed to cameras for the first time!