Chinese Overprint Ink?

Nothing wrong with it, it's likely just on a slightly different paper.

It was the only one I have that looks like it
I do look in my 1955 book
It didn't mention that it's just sloppy inking cause of the times lol
Clearly we have established many times already
I need a updated book
But until I get it I use what I got
And if I see something different even slightly
I ask cause I don't know or pretend too
It's stamps lol
only people I have ever known to collect stamps
Was my grandma
She died so it's not like I can ask many people questions
So I ask a forum cause it makes sense you'd get a answer
Sorry if it's a basic question

To show I'm learning lol
Ok so a 532 c20
See if I get this right that's the 150$ dollar question lmao

Even got the pic right lmao

But I'm sure I'm wrong lmao
Just seen the big 150$ and seen something that looked close

Ok, I'll bite.

What makes you believe this last one is a C20? Wishful thinking aside, the odds of having that one high dollar variety in a sea of low value stamps is pretty low.

Is this a collection you're planning to continue or something you're looking to part out on ebay stamp by stamp?

Dale

This is a p20 (Hupeh) The whole surcharge is squarish.
c20 (Hunan) is more rectangular in height.

Again I'm using a 1945 book
Probably wishful thinking as stated
But this is why I ask-
Blue-matches
Red-doesn't
In my 45 book
Not I'm sure the inking doesn't always have to be
100% but it leaves it open to ask questions

Is this another example of the times
Sloppy work or just mix n matching Of the dies
Possibly just the way it is lol
Again my book doesn't give silly details
So I gotta ask

Looks like i20, Kwangsi to me. I never assume one is a rare variety. I always assume it is common until I can prove it is rare.

The stamp has the secret mark. Therefore, if watermarked, one of the types of Scott #534. If unwatermarked, one of the types of Scott #536. Kwangsi works for #534, but not for #536. Hupeh works for #536, but not #534. Spacing of the lower line of the overprint inclines me toward Kwangsi. But first we'd need to know about the watermark.

i20 is on the yellow green stamp number 411. The op's stamp is the blue green number 318.

Color could be either the blue green of #318 or the deep yellow green of either #411 or #430. Agree that blue green seems right. But then what about the secret mark? Only #411 and #430 have that, no?

i20 is also on 318. There is no way that is a Hupeh. The bottom of the 2 is flat.

Based on the secret mark then you would have either 534 or 536 depending on watermark which you can sometimes see without needing fluid. 533 or 535 the overprint is black.