Reference
Note:
Thierry (CMVS) included these zinc coins among his category of 17 private issues of 'Thien Minh type', in his subgroup with Chinese rather than Vietnamese inscriptions. He attributed them to the period 1746 - 1774, as explained in his CMV, pp 22-23.
Reference
Hartill GCC : Page 118, 128, Figure 2.635 (sic) (number duplicated in error for 2.636)
Note:
Hartill tentatively assigns this issue to his Zinc Group 3 with 'square, right protruding head thong'.