Reference
Barker : Page 238, Figure 103.11
Reference
Thierry CMVS : Page 81, numbers 450 and 454 [not illustrated]
Note:
Thierry (CMV, p. 29) indicates that the nominal weight for the zinc coins under Tự Đức was 6 phần, although they clearly varied widely between about 1.8 and 3.9 g (see Thierry CMVS, page 81).
