K3601, Chong-Zhen Tong-Bao Coin (Two Dot), China Ming Dynasty, AD 1628.
VF, please refer the picture.
This is two dot "Tong", which is rare than one dot "Tong".
Minted by China Ming Dynasty Last Emperor "Si Zong" during AD 1628-1644.
Catalogue Number: H20.292 (David Hartill), FD2026 (Fisher's Ding), S1232 (Schjoth's).
Size: around 21 to 23 mm in diameter.
Weight: around 3 grams.