Hammered Coin. ID Help Please.

That type was used from Edward I through Henry VII. It's hard to nail down without legends or MMs.

It looks like a quatrefoil in the center of the reverse, which I think would mostly (completely?) eliminate the early Edwarian types and push it to Henry IV & later.

Someone who specializes in these might be able to identify it by the style of the crown. There's a series of small books by Chris Wren covering these issues in pretty good detail.

I think this is an Edward IV penny from the York mint, under Archbishop Neville (S 2125). You can tell by the letter G to the left of the bust (and a key to the right). The crown is of that period and there is also a quatrefoil on the reverse https://en.numista.com/catalogue/pieces128365.html

Edward IV pennies often come with the legends missing https://en.numista.com/catalogue/pieces336785.html

I don't think the flans were particularly spacious but they were clipped.

This contemporary counterfeit of an Edward IV penny from York was probably made in Henry VII's time (5-10 years later). By then, any genuine Edward IV pennies would have had their legends clipped off, so the counterfeiters made them the size of the clipped coins to make sure they wouldn't stand out - this coin is more or less as struck. It would have helped that the genuine coins were worn and clipped, as it would've been hard to tell the difference.

Edward IV Contemporary Counterfeit, 1490-1500

London, imitating York. Silver, 15mm, 0.42g. Facing bust; ECARCVS CEI (G)RA REX (instead of EDWARD DI GRA REX ANG). Long cross with quatrefoil; (CIVI TAS) EBOB ACI (instead of CIVITAS EBORACI); York reverse 3. Small letters; same broken B for B and R. From the Queenhythe Hoard.

Thank you all for the help!
Very interesting info John.