Due to unclear instructions, many post offices overprinted old stamps when China became a republic instead of waiting for the official overprints. These provisionals were quickly withdrawn. Other than having auction catalogs illustrating covers, it may be impossible to tell where they originate. The cancel on yours might help.
Thank you, hy-brasil . I didn't realize that there were so many different types of overprints tath co-existed with the official one's. You gave me a very good idea ,I admit I didn't tough of this .The cancel on the stamp may truly help solve the problem.
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