The Jaeger-LeCoultre Reverso Classic Monoface Origin Q3878520 is a 2025 model featuring a sleek Monoface Origin design, complemented by a blue alligator leather strap. With dimensions of 32.5mm by 16.3mm, it reflects the proportions of the inaugural Reverso Dame from 1931, integrating this classic dimension into the modern Reverso lineup. The case, crafted from polished stainless steel, has a thickness of 6.95mm and is water-resistant up to 30 meters. Its unadorned reverse side can be customized with engravings or lacquer. The silvered dial showcases a sunray guilloché center, which transitions into a chemin-de-fer minute track, while the vertically brushed perimeter features applied Arabic numerals. Powering the display of hours and minutes is a reliable quartz movement.