Need Help With A China Overprint

I can't find this overprint in the Scott catalog. Is this an overprint for use in one of the "provinces"? Thank you.

Basically, if the overprint contains that character at the bottom left, it's very likely a savings stamp. That's the character for gold, and implies money. (That same character is the first of two characters that mean "bank". -- I read Japanese at an elementary level, but this is one of the occasions where Chinese and Japanese use the exact same characters.)

So, if a collector can learn to recognize that character (kinda looks like a side view of a picnic table (with 2 feet!) under a roof), then you know there's a really good chance that it's a savings stamp, and won't be listed in Scott.

If there are some exceptions to what I just described, I hope someone will be able to elaborate on it for us. I just wanted to provide a quick tip.

(I collect Japan, but have found myself with stamps from China every now and then.)

Thank you, perf12 & Philatarium.