Everyone's favourite - Chinese Cash ID #2! Help please.

Most of you know me...my best friends call me cash...no they don't but I need your help:
I know some of these pictures will appear the same to you, but I have a disease known as cashblindness: I can see the coins I just can't make any sense of the characters and try and ascertain what they are...so I thought I'd make it a fun new thing for Numista. I know they are people on here (with one person in mind mainly) that will be able to help: so apologies for upside down scans and a number of cash faux pas...but here they are all 21 of them:
1.

2.

3.

4.

5.

6.

7.

8.

9.

10.  

11.

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

 

I think I heard my name.

Hey Ben, I'll help you out!

1. https://en.numista.com/catalogue/pieces13110.html
2. https://en.numista.com/catalogue/pieces1133.html
3. https://en.numista.com/catalogue/pieces19759.html
4. https://en.numista.com/catalogue/pieces27690.html
5. milled copy
6. https://en.numista.com/catalogue/pieces19759.html
7. C#26.3
8. C#26.3
9. https://en.numista.com/catalogue/pieces1133.html
10. rare Sinkiang 10 Cash?
11. https://en.numista.com/catalogue/pieces1133.html
12. https://en.numista.com/catalogue/pieces7996.html
13. https://en.numista.com/catalogue/pieces3539.html KM#440.2
14. https://en.numista.com/catalogue/pieces7381.html
15. https://en.numista.com/catalogue/pieces7996.html
16. https://en.numista.com/catalogue/pieces7381.html
17. https://en.numista.com/catalogue/pieces7996.html
18. https://en.numista.com/catalogue/pieces26024.html
19. https://en.numista.com/catalogue/pieces7381.html
20. obverse?
21. obverse? (upside down too)

The only "valuable" one is number 10, probably worth a dollar or two. The rest aren't worth less than a quarter each.

Speaking of the ten cash coin, I couldn't identify it because it's hard to read. Plus, I think it's upside down. When reading Chinese coins, be sure that you flip the coin medallically.

Thanks SmartOneKg,
I'll get the obverse of the others to you soon. Thank you for your help. Will need to do this carefully (i.e. catalogue).
Ben

Here are 20 and 21 again, this time with the obverse.



Here is 10 again.

Thank you for your help so far. Also, do 7-8 need to be listed on Numista?

You might not be surprised.

20. https://en.numista.com/catalogue/pieces7996.html
21. https://en.numista.com/catalogue/pieces7996.html

Aha so number 10... what the hell is that? What I can tell you here is that I can sort of see 光緒 on the front, but the bottom character looks like the characters for 道光. So I really can't tell.

Are you sure you rotated it medallically? On the right of your new photo I kinda see a 十. You might want to double check.

The ones that I couldn't provide a link mean that they are coins not on Numista yet.

A late reply on this, thank you for your help, Smartonekg!
I don't think I'll place the mystery 10 cash on here, it is to mangled to truly make out.