Dao Guang - H#22.570, tagged as Not Recorded !!!

Radical of tong with a clear bent left bottom line, probably 6 stroke bei, two dots tong, no protuding boo. diam: 24.2, weight: 4.04g

It's clearly H#22.570, tagged as not recorded in the Hartill first edition. (is it still not recorded in the second edition ?)

N#26024

I should  rather class it as a fake

but I had her cousin in my collection with similar material, calligraphy and general appearance.

H#22.576 - diam 24.2, weight: 4.0g, straight bottom line of tong, west branch

I'm turnin' my head up and down, turnin' turnin' around, and all that I can see is just another standard Dao Guang
And I wonder …

I have the similar coin too, but not entity the same. I can see the character 光 (bright) is not the same and I believe the font for others are a bit difference, or perhaps due to wear and tear. Mine is in a very poor condition. 
 

BTW, I have no idea about my coin except that it's from the last Qing dynasty.

Update: 

I hope you do not mind me posting my coin on your threat. If you think this is not appropriate, please let me know and I will delete my contents. Thanks

On your coin, the mint is erased so you can only know that it is a coin of the emperor 道光 which means “splendor of reason”.

I can confirm that the 4 characters on the front are the same as yours. My technique for taking pictures with my phone is not that great. On the back this  bit is missing and it seem like it have been flatten/worn out

So your coin is : 

Hartill#22.574: Type A2; radical マ in 通; two-dot Tong; flat top Boo (East branch)

Back to my coin

Radical of tong with a clear bent left bottom line, probably 6 stroke bei, two dots tong, no protuding boo. diam: 24.2, weight: 4.04g

It's clearly H#22.570, tagged as not recorded in the Hartill .

I may be misinterpreting the term "bent" bottom line.
Is my coin type A1 or A2?

It really does look like Hartill#22.570. My opinion is that your's is A1 type, probably 6 stroke bei, two dot tong and no protruding boo. Have you used Zeno.RU, or Facebook group called “Ancient Chinese Coins”, which has David Hartill as a member. 

I've looked to sur Zeno without succes, I'll try the facebook chanel

I am not yet accepted in the Facebook group, maybe it is very restricted and I should introduce myself as an eminent specialist in Ming dynasty coinage 🤪
In the meantime, on the Numista page, it says "flat top Boo" for the East Branch, which does not appear on the Hartill.
So what is this "flat top Boo"?

Hello

Take a look on your Hartill for 22.625 and 22.609 22.610

I think 22.625 is flat and the other ones rounded

We van note that in the reference "Qing Dynasty Qian Pu.清朝錢譜", different shapes of Tong are listed butthere is no mention of Boo :

I don't Know Who and with wich reference someone add this information in Numista 

Ollisaarinen

… Facebook group called “Ancient Chinese Coins”, which has David Hartill as a member. 

“All that glitters is not gold.”

The Merchant Of Venice, Shakespeare