Coin ID please (used Google lens)

I have acquired this  small brass? coin, or could be a token or coin weight. Tried Google lens, but closest is some old Russian coin. It weighs about 7.85 grams, is 22.5mm diameter and 2.5mm thick. TIA.

 Yes looks more like a coin weight. 

 This also has D G letters 

N#334679 

but is different from yours. 

Think it means 5D : 3G whatever that could be, 

and so is not someone's initials seemingly. 

 Different: N#60153 

and more information of letters. 

 So it becomes now 5Dwt : 3Gr but not yet sure of meaning. 

Dwt is pennyweight. It is 1/20 Troy ounce.

 It is for a Guinea denomination coin. 

https://www.ukdfd.co.uk/ceejays_site/pages/Coinweight2.htm 

 Quote: 

Summary of the 1774 Proclamation

Guineas coined prior to the commencement of the reign of the King (i.e. before 1760) [Yours is 1750] 
          Coin             Value          Weight    
   One guinea     20s 0d        5dwt 3gr   

 Just seen reply while I was making that - yes, pennyweight. Thanks 

Thank you for the replies. Taking a bit from both of your replies, I am thinking that the lettering reads downwards, i.e. 5D (5 pennyweight which equates to about 7.75 grams, and G3 for George III, I think the date is 1760 with a weakly struck 6, so a coin weight. On second thoughts, it could be 5.3 pennyweight which would be nearer the weight of a Guinea, but then, what is D G?  

trickyd

, but then, what is D G?  

 Already answered - D is Penny, as in Pennyweight (from L S D - Pounds Shillings Pence) 

and 3 G is 3 Gr but not 3 Grammes but 3 Grains. 

 Earlier reply:  5dwt 3gr 

 Each 1 Pennyweight = 24 Grains 

https://www.lbma.org.uk/wonders-of-gold/items/the-pennyweight 

 so 5 and 3/24 Pennyweight= 1 Guinea before 1770 date. 

See previous replies. 

OK, thanks. So I now know it's a coin weight, but going by the 5 and 3 being dwt and gr I get a weight of approximately 7.9 grams, about the weight of the item, but nowhere near the weight of a Guinea, so what gives?   5.3 dwt  is about  8.24 g, which is much closer to the weight of    1 Guinea. This numismatic thing isn't easy, but it is interesting.

 It does say in one of the links that over time the weight of the Guinea changed. 

So in 1750 that was the correct weight. It got heavier a few years later. 

I'm a little confused, too. Every Guinea (in the Numista catalog) is 8.4 grams.  5D:3G = 7.97 grams. Maybe the standard weight for 1 Sovereign instead?

Isn't a Guinea 21 Shillings?

Edit: I see this table from your link:

What I don't understand is why the weight of all Guineas in the Numista catalog is 8.4 grams.

 Maybe that is the equivalent weight of the last time the denomination changed. 

In that chart there are four values and so four weights. 

20s 0d / 20s 6d / 20s 10d / 21s 0d 

 5d 3g   /  5d 6g   /  5d 8g   /   5d 9g 

I'm sure there's a logical explanation but I'm still confused.  Every Guinea in Numista has a weight of 5D:9G (8.4 grams) regardless of the date it was made.  So there's no increase in weight from before 1760 to “New Coins.”

I've got a very similar coin.

 Similar, dated ten years later 

https://www.galata.co.uk/ireland-j-warren-coin-weight-for-a-half-guinea-1760 

 The D is for Penny [Denarii] 

The G is for Grains - the J is a 1 so is 13.½ Grains 

= 2 Pennyweight 13.5 Grains 

 Later in 1772 the weight [½ Guinea] increased to 2D 16G