Tibet, 1923 AD., Trapchi mint at Lhasa, Sho, KM Y 21.2.

Tibet, Trapchi mint at Lhasa, 1923 AD.,
1 Sho (ø 24,5 mm / 5,54 g), copper, axes irregular alignment ↑← (ca. 260°), plain edge,
Obv.: the name of the Tibetan government starting on top (at 12 o´ clock): dga' ldan pho brang phyogs las rnam rgyal (spoken: Ganden phodrang tschogle namgye), each syllable written into one of the 8 petals of a lotus flower. In the middle circle a lion standing left, looking backwards, dots in obverse angles.
Rev.: two cycles, cyclic year ༡ ༥ - ༥ ༧ (15-57) at position 5 and 10 o´clock in outer cycle, dots in reverse arabesques.
KM Y 21.2 .

For more info about conversion of dates of the Tibetan calendar see http://apps.creounity.com/time_machine/en/index.php?go=tibet.php

Tibetan cyclic Year dates (flanking western date) / Details
15 (1918) 52 KM Y 21 (central legend horizontal; large size 25.6mm)
15 (1918) 52 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist) overdate exists
15 (1918) 52 KM Y 21b (lion left, looking backwards; large size 25.6mm)
15 (1919) 53 KM Y 21.1 (without dots in obverse angles; without dots in reverse arabesques; weight varieties exist)
15 (1919) 53 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist)
15 (1920) 51 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; error "51-15": cycle and "15" transposed)
15 (1920) 54 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist)
15 (1920) 54 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; year and "15" transposed; lion type 2)
15 (1920) 54 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; error: year and "15" transposed; lion type 1)
15 (1920) 54 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; year retrograde)
15 (1920) 54 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist)
51 (1920) 54 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; error "51" instead of "15")
54 (1920) 15 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; error "54-15": cycle and "15" transposed)
15 (1921) 55 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist)
15 (1921) 55 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; error: year and "15" transposed)
15 (1921) 56 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; with overdate variety)
55 (1921) 15 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; error "55-15": cycle and "15" transposed)
15 (1922) 55 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist)
15 (1922) 56 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist)
15 (1923) 56 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist)
15 (1923) 57 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; error: year and "15" transposed)
15 (1923) 57 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist)
15 (1923) 57 KM Y 21.1b (without dots in obverse angles; without dots in reverse arabesques; weight varieties exist)
15 (1924) 58 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist)
15 (1924) 58 KM Y 21.1b (without dots in obverse angles; without dots in reverse arabesques; weight varieties exist) rare
15 (1924) 58 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist)
15 (1924) 58 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; error: year and "15" transposed)
15 (1925) 58 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist)
15 (1925) 59 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist)
15 (1925) 59 KM Y 21.1b (without dots in obverse angles; without dots in reverse arabesques; weight varieties exist)
15 (1926) 59 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist)
15 (1926) 60 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; error: "6" instead of "60")
15 (1926) 60 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist)
15 (1926) 60 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist)
15 (1927) 60 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; "16-1" overdate variety)
16 (1927) 1 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist)
15 (1928) 60 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist; "16-2" overdate)
16 (1928) 2 KM Y 21.2 (Dots in reverse arabesques; weight varieties; size of circle varieties exist)
16 (1928) 2 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist; error: retrograde "2")
16 (1928) 2 KM Y 21.1a (lion left, looking backwards; with dots in obverse angles; without dots in reverse arabesques; varieties in weight and size of circles exist)