It seems quite interesting what is said about the development of the 053H frigate at
https://www.globalsecurity.org/military/world/china//jianghu.htm:
The No. 701 Institute began to research the concept of a guided missile frigate specialized with both anti-air and some anti-ship capabilities. From 1966 to 1969, the conceptual design of the frigate involved a diesel/oil engine. The development of the ship was carried about by the Hutong shipyard, No. 701 Institute, and navy.
Development and construction of the frigate was almost completed in the mid-70s, until the primary mission of the frigate, which was anti-air, was changed to anti-ship due to the needs of the PLAN. Resultantly, the weapon systems of the frigate were modified. Instead of a fitting the frigate with anti-air missiles, the frigate was now re-equipped with anti-ship missiles and systems. Instead of twin 100mm cannons, the frigate was now equipped with a single-barreled 100mm cannon. By 1976, the newly re-oriented anti-ship frigate was finished and designated as the Type I anti-ship guided missile frigate.
My understanding is that initially the Chinese wanted to have a frigate with primary AA capability and secondary ASuW capability. It was to be armed with anti-air missiles and twin 100mm cannon (perhaps with anti-ship missiles as well).
Then they changed their mind and the frigate became a single-purpose (ASuW) ship. So anti-air missiles were dropped (and replaced with AA 37mm guns) and the twin 100mm mountings (perhaps something had gone wrong with their development) replaced with the old hand-operated single mountings. And the ASuW missile battery was probably doubled.
So it looks quite possible that the model we have here represents the early version of what eventually became the 053H.
Two questions appear:
1)
What was the abortive twin 100mm mounting? Was it somehow based on Soviet desings, e.g. B-54, MZ-14, MZ-16?
2)
What anti-air missiles system was to be included in the original project? The model has something looking like a quadruple launcher similar to the Sea Cat.
Did the Chinese try to copy the Sea Cat or built someting along the lines of the Sea Cat? If so it would be a short-range missile system intended to replace light AA guns. Apparently the development of such a system ran into some problems and was cancelled, so the Chinese navy must have still used old AA guns.
Piotr