Identifying a coin, help please

25mm diameter, silver but very worn on both sides, particularly the lettering.  On the side that appears to have a wheatsheaf I can see A:S:G at top left. Top right maybe REG, towards centre bottom AST. 

on the side with the shield, at top left of shield is a G.

the shield is quartered. Bottom left and right quarters are vertical lines. 
Top left/bottom right quarters are themselves quartered. I can make out a lion In top left quarter.

any help as always is appreciated 

The shield looks to be that of Spain used on coins in the 16th century

https://en.numista.com/catalogue/index.php?e=espagne&r=&ct=coin&im1=&im2=&tb=y&tc=y&tn=y&tp=y&tt=y&cat=y&ru=&ca=3&no=&v=&i=&b=&d=&u=&a=&dg=&m=&f=&t=25&w=&mt=&g=&se=&c=&wi=&sw=

Searching Spain and 25mm coins, some similar things come up.  It's not likely that exact coins is on Numista.

Just a guess.  

Perhaps Spanish Netherlands, as the other side appears to have arrows (seven?) representing the united (?) provinces.

I hope for you that it is not this one N#150707

Tovarich

The shield looks to be that of Spain used on coins in the 16th century

 

https://en.numista.com/catalogue/index.php?e=espagne&r=&ct=coin&im1=&im2=&tb=y&tc=y&tn=y&tp=y&tt=y&cat=y&ru=&ca=3&no=&v=&i=&b=&d=&u=&a=&dg=&m=&f=&t=25&w=&mt=&g=&se=&c=&wi=&sw=

 

Searching Spain and 25mm coins, some similar things come up.  It's not likely that exact coins is on Numista.

I weighed my coin (finally) and it came back at 8.00 grammes. The mystery deepens.