Reaching into the old bag of tricks, I came up with this
1947 cover from Yishan, in southern Chekiang/Zhejiang, to Shanghai. The Shanghai receiver is extremely faint, but I think I can just make out enough from it to say that it shows the date Chinese style. That suggests that your Shanghai CDS, Rod, may have been used on mail for foreign destinations, with local mail receiving Chinese dated CDSs.
I do not know any China postal history, will search some information about the usage of such Chinese-English dater. For the value, I guess it is not worth much because such dater from big city is very common in the market.
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