Bhutan 1/2 Rupee coin

Hello eveyone,

I have a Bhutan 1/2 rupee coin and with reference to Numista, there are two Varieties of that coin(which appear similar to my coin) which are mentioned below.

(1) ½ Rupee - Jigme (1951-1955)
https://en.numista.com/catalogue/pieces30856.html
(2) ½ Rupee - Jigme Dorji (1955-1968)
https://en.numista.com/catalogue/pieces9170.html

In either case they have mentioned the year of issue but I am not find the year of issue on the coin. Can anyone please tell the way to find the year of the coin or any the way to identify which variety of this coin I have. As marking on my coin are bit worn off, it has become difficult to identify the coin.

Thank in advance.

The portraits are of 2 different kings on the coins you link so compare closely to the illustrations on Numista. Distinguishing years is much harder as Numista entries do not match SCWC. Distinguishing by weight can help.

Will