Nepal ND (1974) P-25s PMG Superb Gem UNC 67 EPQ 50 Rupees (Specimen)
Surpassed by just a single finer example in the PMG population report, this was issued back in the 1970s and is surprisingly difficult to find in both as both an issued note and a specimen.
PMG Population in 67 EPQ: 3 (1 Finer)