Here they are, from 1,400 used specimens. Scott has three types... Watch out for the 1L5, it is super rare!
1E1, issued January 1936.
1E2, from 1937
1E3, from 1939 to 1944
1E4, from 1940
1E5, from 1943/44, rare, small RA
NGR, from 1945
NOP, unwatermarked opaque from 1947/48
2C, Straight Rays from 1949
CL2, clay from 1952
1L1, from 1951, deep orange background
1L2, from 1952, pale red, medium to gigantic RA, poorly defined
1L3, from 1955/56, bright white paper and deep yellow background
1L4, similar to 1L2, with a partially visible watermark
1L5, similar to 1L2, white Zarate, rare