Please help identify two Tibet coins

These two pieces are driving me crazy. I'll find the design of one side, but the other won't match. I'd like the date and Krause number if possible. The large coin measures 31mm, silver, reeded edge; the smaller measures 24mm, silver, reeded edge.

 

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The second one (big coin) is 3 srang. The first one (small coin) is 1-1/2 srang.

 

Well, that's a start, thank you. Can someone else supply the Krause catalog numbers and the dates?

 

Y # 24 & Y # 26.
1-1/2 srang: 1936, 1937, 1938 or 1946.
3 srang: 1935, 1936, 1937, 1938 or 1946.