Japanese objects are dated in era years: Meiji 6, ShÅwa 20, Reiwa 6. Year 1 of an era is the year it was proclaimed, even if that was December. The desk covers Meiji (1868) to Reiwa. Earlier nengÅ changed too often for a short plaque.
Era starts: Meiji 23 Oct 1868 (retroactive to 3 Jan), TaishÅ 30 Jul 1912, ShÅwa 25 Dec 1926, Heisei 8 Jan 1989, Reiwa 1 May 2019. A print dated âMeiji 45 / TaishÅ 1â is 1912. This desk uses calendar years, not the exact proclamation day â good enough for a caption, not for a legal document.