Shandong was one of the large arsenals in China. The Chinese have "reverse engineered"several older firearms, notably Winchester 97s, Ithacas, etc. No first hand experience- reports of problems with soft steel, bad heat treat of small parts, etc. Some Ithaca parts MAY swap, some not. Reliability not as high as Ithaca. A gun I am popping doves with is one thing, defense is another. Altho ANY gun may be better than NO gun, this would not be my first choice.
What's it worth? Well, how much did you pay for it? It is worth at least that much.