Reference
Note:
This is a small-sized private issue related to the three coins illustrated by Hartill, with wide rim as in 2.808a, but with Thông more akin to that in Fig. 2.808. Hartill assigns these to his "small Copper - Distinct Calligraphy, Group1. ("An Phap Type")
Reference
Thierry CMVS : Page 47, cf coin figured as #115, but distinct form of Thông.
Note:
Thierry dates these rather widely between the 11th and 16th centuries. However since he states that the design is inspired by the Đại Hòa Thông Bao of 1443-1453, we can assume that it must date from not earlier than 1443.