A spectacular complete group of 12 engraved essays (proofs) depicting King Ferdinand I. Prepared in two denominations, 5 Lei and 10 Lei, each in multiple colour trials. The presence of the value tablets confirms these are late-stage essays, not simple colour tests. Highlights 12 different essays: varieties in colour for both 5 Lei and 10 Lei. Engraved, imperforate, on ungummed paper as produced; crisp impressions and fresh, bright inks. Provenance: from the archive of an old Romanian noble family, conserved privately for decades. Historical interest: Ferdinand I, the architect of Greater Romania, makes these proofs especially desirable for Romanian royal and interwar issues specialists. Condition XF to superb; clean fronts and backs, sharp impressions, even margins; no faults noted. Remarks Museum-level ensemble of Romanian philately—final-development essays with denominations, seldom offered as a coherent group and with distinguished provenance. Included in the lot All 12 imperforate essays exactly as pictured.