1949 People's Post of China Northeast Issue - Building of the Communist Party Headquarters

This is a vintage postage stamp from the People’s Post of China, specifically a Northeast Liberated Area issue dating back to the late 1940s (circa 1949). The stamp features a blue-gray monochromatic engraving of a prominent Western-style multi-story building, identified as the headquarters of the Communist Party in the Northeast during the revolutionary period. The central image is flanked by two stylized trees and bears a flag atop the building. The paper is an off-white or yellowish cream stock with rough, irregular perforations (gauge appears coarse), which is typical of regional wartime/transitional printing. A significant circular cancellation mark in black ink is visible on the left side, featuring the numerals '1.17.11' and Chinese characters indicating the post office location ('Beijing' or regional branch). The bottom of the stamp contains Chinese characters for 'People's Post' (中国人民邮政). Regarding condition, the stamp shows signs of circulation with significant perforation wear, some minor discoloration consistent with age, and a clear, heavy postal cancel that obscures some fine details of the building's architecture. The engraving style shows moderate detail in the windows and facade arches, reflecting the utility-focused printing quality of the era.