A Mirro-Krome card published by J. Boyd Ellis of Arlington, Washington, this unused mid-20th-century chromatic postcard presents a pack train traversing the high country of Olympic National Park. The scene, captured on Ektachrome by the renowned Pacific Northwest photographers Bob and Ira Spring, depicts a single rider on a brown horse leading a string of at least three pack animals heavily laden with canvas-covered gear along a narrow, rocky trail. The foreground is a dry, grassy slope punctuated by tall subalpine fir trees and a wooden trail marker, while the background opens onto a vast panorama of deep blue valleys and distant snow-patched peaks under a pale, hazy sky. The printed caption on the verso precisely identifies the location as the summit of Hayden Pass, with the glaciated mass of Mount Olympus visible in the distance, underscoring the rugged character of Washington's Olympic Peninsula wilderness. The postcard’s vivid, high-gloss finish is characteristic of the H. S. Crocker Company’s Mirro-Krome process, a mid-century color lithographic technique that produced saturated, enamel-like surfaces popular with collectors of vintage scenic view-cards. Condition is good, with minor edge wear, light age-related yellowing, and scattered foxing near the edges, but no writing, stamp, or postmark mars the verso. This image evokes an era when pack trains were the essential logistical backbone for supplying remote lookout towers, trail crews, and backcountry camps in national parks before the advent of helicopter support. The association with Bob and Ira Spring, whose photography defined the visual identity of Pacific Northwest alpine landscapes for decades, adds significant documentary and collectible value. This is a classic example of a mid-century chromogenic postcard from a celebrated regional publisher, capturing a bygone mode of wilderness transport against the dramatic backdrop of the Olympic Mountains.