Unknown Chinese coins to me, so desperate for help

I was sent these two coins as part of a recent exchange as additional gifts, but the sender had no idea of actual identity except possible some sort of Mon.

The coin on the left.

Diameter 23mm

Weight 3.22grms

The coin on the right

Diameter 24mm

Weight 3.59grms

The Chinese characters on both coins look the same so assumed they were the same coin until I measured them this morning

Any help would be gratefully received especially as I do not have any of this type of coin in my collection

Looks like Japan

     寛
寶　通
　永

Also, it is upside down
But I guess you already know CoinMan

 Pictures brightened, rotated, cropped 

1 [23mm / 3.22grms] 

2 [24mm / 3.59grms] 

 Apart from the size, they look similar to this 

N#121454 [25mm] 

 or this 

N#283929 [24mm] 

N#283917 [no size] 

Geison,

I actually had no idea which way up the coin went so guessed, and was wrong.

ZacUK,

Had a look at the links and still totally bemused. Glad I really only collect from 1900

So many coins look so similar, how can they be separated.

Need to spend a bit more time looking at the links but the information contained on each listing is like trying to decipher the Enigma code

This is 1 Mon “New Kan'eitsūhō”.；N#121454

There are many varieties of “Kan'eitsūhō”.Only a small portion of the sites are listed on Numista.

We recommend registering as UNK.

amakitu,

I have absolutely no idea how to add this coin, and therefore give you permission to add it yourself using my photographs

coinman1 (Geoff)

COINMAN1

amakitu,

I have absolutely no idea how to add this coin, and therefore give you permission to add it yourself using my photographs

coinman1 (Geoff)

Please push “Add to my collection”

Hello 

The second coin is not the one with the dot 

It's  a mold error

I really need a link to both coins, as I have actually no idea where to even start. With each link, a reverence number would be very helpful, as looking on the other reply I had, there are many differences to the same coin, due to different Chinese symbols.

Again any help would be gratefully received, as I am totally lost

Hi.

Small one (1708) – 四ツ宝銭勁永 YOTSUHŌ-SEN KEIEI

Large one (1728) – 仙台石ノ巻銭異書長通 SENDAI ISHINOMAKI-SEN ISHO CHŌTSŪ

These are 宽永通宝

You can read about it here (use google translate for English)

 https://baike.baidu.com/item/宽永通宝/5211765