Bhutan, 1967-68 AD., Jigme Dorji Wangchuk, ½ Rupee, KM 28.

Bhutan, Jigme Dorji Wangchuk (1952-1972 AD.), Calcutta mint, dated "Iron Tiger year" (1950 AD.), actually struck 1967-68 AD.,
½ Rupee (24 mm / 5,12 g), nickel, 5,08 g mint weight, mintage 10.000.000 ,
Obv.: "2nd king of the Dragon Contry Jigme Wangchuk" , crowned bust facing left.
Rev.: "Iron Tiger year, half Indian rupee" , field divided into nine sections, one symbol in each section.
KM 28 .

from Nicholas Rhodes - COINAGE IN BHUTAN: http://himalaya.socanth.cam.ac.uk/collections/journals/jbs/pdf/JBS_01_01_04.pdf :
In 1928, the second King asked the Calcutta mint to strike some silver half rupees, and some copper pice, for use in Bhutan. The coins were designed by Mr A.P.Spencer, the Chief artist/engraver to the Calcutta mint, from a rough design supplied from Bhutan. Some 20,000 half rupees
were supplied in 1929, but it was noticed that there was a small mistake in the legend, and this was corrected when a further 30,000 pieces were sent in the following year. At the same time, 10,000 copper pice were sent, with the correct
legend.
In 1950, and again in 1954 and 1967, half rupees were supplied by the Calcutta mint to Bhutan, by now they were made of nickel or cupro-nickel, but using the same dies. Initially the unchanged date (Earth-dragon year, 1928) was used, but was later replaced by a new year (Iron-tiger year,
1950). In both cases, however, the incorrect obverse die was used, with the error in the legend, but this raised no objections, and the error was never corrected again. Also in both 1950 and 1954, some copper pice, of a new design, reminiscent of the copper coins of the first King, with the
quartered square, were struck in Calcutta.
From 1974, a number of new coins have been struck, both at Indian mints and at various foreign mints, but few have circulated to any significant extent, most having been ordered by outside agencies, and marketed internationally. In practice, coins have ceased to have any local relevance in
Bhutan, and I will not list such recent pieces in this article.
The coins have been almost entirely replaced by bank notes, which were introduced in 1974.