For sale is a rare New Old Stock (NOS) Soviet precision checking square (??????????????????)?? 400×250?? . This is a heavy-duty professional tool made in the USSR according to GOST 3749-77 standard. It features a wide, stable base and is designed for high-accuracy checking and marking of 90° right angles in metalworking, machining, assembly, and sheet metal work. Type :?? (wide base machinist square). Size : 400 mm (blade height) × 250 mm (base). Material : High-quality tool steel (hardened). Condition : Brand new, never used, stored for decades. Comes wrapped in original protective covering with full original technical documentation (passport) and wooden storage elements/box parts. The tool is in excellent cosmetic and functional condition – the surfaces show typical storage patina/protective coating but no damage, rust, or wear. Perfect for professional workshops, tool collectors, or anyone who appreciates Soviet-era precision instruments. These large Soviet squares are sought after for their robustness, accuracy, and historical value. They were made to strict military/industrial standards and often outperform many modern consumer-grade tools.