Date of Issue: 9th April 2021
three stamps (3x 500.- AMD)
those three stamps are issued in mini-sheets of 8 stamps + 2 vignettes
those three stamps are also issued in a mini-sheet of 6 stamps (3 of each) + 4 vignettes
Those stamps are listed in most stamps catalogues (Gibbons, Yvert & Tellier, Michel) and most Europa stamps collectors collect those stamps even if they aren't official stamp issues.