Northern Ireland, Northern Bank 1.7.1970 P-190a PMG Gem UNC 65 EPQ 20 Pounds
The 1970 Twenty from the Ulster Bank is quite a rare note with limited issuance. That was (and still is!) a meaningful denomination, and few remain in Uncirculated grade today. Underrated and scarce.
PMG population in 65 EPQ: 2 (2 Finer)