The coins is An AE4 of Constantine 2nd A.D.337 to 340 the reverse Two soldiers holding two standards. Minted at Trier Germany (TRS) The Brooch is a Hod Hill type named after the site in southern England where large quantities were found.
This one retains its pin which is often missing
Youngted Welcome to T-Net and you have some fantastic finds there , I like the coins from that time.
I really wish we had ones like that to find over here .
Looking forward to seeing more of your finds this summer ! Thanks for sharing the photos .