50c1L1 (paper with laid lines)
50c1L2 (often found with large RA)
50c1L3 (white paper, bright yellow design background)
50c1L5 (Zarate, unreadable watermark)
A small selection of 2p1Ls, not selected for specific papers.
The 5P1L2
The 10P1L2
The 20p1L2, a desirable stamp.