Curious About These Any Knowledge

This is what I found in my book that looks similar
Might have seemed like a joke question about the difference
But when you read secret mark you tend to look closer
And it's easier to remove from a stamp them add
Thanks for any help

Apologies if it seems like dumb questions being asked
But you read secret mark you look
There's no value to any of the stamps as far as I can tell
But I was actually something interesting lmao

Am I missing something totally obvious!!
Should they not all be pretty identical
As stated before I'm new and flooded with too much information

Probably nothing but there are differences

Can someone please point out the obvious joke
Kinda feeling like I've been left hanging

The secret mark you are looking at is for types 57 only. (scott) Sun Yat sen.
https://goscf.com/t/66751

Thanks perf12
Trying to absorb as much as I can
And keep things interesting lol
Is there supposed to be differences between the area I'm pointing out
I am completely novice at all this and trying to find interesting things
The thought of a secret mark sounded fun
And looking at the small differences
Made them not the exact same
I see how I was looking at the actual secret mark stamp all wrong #9786;#65039;
But is there anything to the small differences
Gotta ask questions sometimes to understand

Those martyrs issue stamps were surcharged.So there are small differences in the characters due to inking.
The Martyrs issue stamp itself does have a secret mark.It is more of a difference in the plates used (old & new plates).
List and pic below:
http://values.hobbizine.com/chinastamps/1940.html

Can I get some pictures posted to compare
Might seem silly but hey Gotta find something to keep interest
After all they are just pieces of paper but it's the details that make a difference
And questions never asked don't get answers

Again thank you perf12

Experience also comes from those who share it less room for confusion

If you look at the stamp Vayolene posted you will see a thoroughly inked overprint. But just look at the bottom of the 20.00 on your stamp, much of ink is missing. This lack of ink is also apparent on the Chinese character in the lower left corner of your stamp and therefore it looks different from what is in the book and what is on Vayolene's stamp.

Also learn how to rotate your images before you post, very annoying to look at sideways stamp

Sorry about the bad pic posting

Thanks willlwood42
I know it's probably silly and nothing
It would make things way clearer for me if vayolene
Could post a Picture Of up close

Or if anyone could post up close pics