QING: Tong Zhi, 1862-1874, AE charm (24.48g), CCH--, Fonrobert-1790, dang wu shi (50 cash) on reverse, Fonrobert number inked on obverse and reverse rims, VF, R.
Likely an early Min Guo period (Republic era) 1920-30s production by metallic composition and style. In the name of the Board of Revenue mint, although privately produced.
Estimate: 150-200 USD