Up for sale/sale is a highly authentic, historically significant World War II U.S. Army Signal Corps Barograph ML-3-A. Manufactured in 1942 by the renowned Julien P. Friez & Sons division of Baltimore, Maryland, this heavy-duty tactical microbarograph was designed to continuously track and graph atmospheric pressure shifts for military weather operations.MECHANICAL CONDITION:• Tested & Working: The internal mechanical clockwork drive has been tested and still ticks beautifully when wound.• Completeness: The unit is remarkably complete for its age. It includes the original long pen linkage arm, the pressure-sensing mechanism, the central rotating chart drum, and even retains the original purple ink bottle securely nested in its interior holster.COSMETIC CONDITION:• This unit is in true, untouched battlefield find condition. It possesses a fantastic original patina with minor surface oxidization on the rugged aluminum casing, showing its authentic military history.• Please note: The right-side glass panel has a hairline crack (visible in photos), which is an easy fix if you choose to restore it, but the structural frame is completely solid.HISTORICAL MARKINGS (From Original Data Plates):• Plate 1: \"BAROGRAPH ML-3-A | U.S. ARMY | SERIAL NO. 63-42 | ORDER NO. 4543-PHILA-42 | MADE BY JULIEN P. FRIEZ & SONS, BALTIMORE, MARYLAND\"• Plate 2: \"WHEN PURCHASING ACCESSORIES SPECIFY: CHART NO. WDSC-98 | INK NO. 10 | PENS NO. 1 | CAT. NO. 792 | SER. NO. 870 | JULIEN P. FRIEZ & SONS\"This is a premier cross-collectible piece perfect for World War II militaria collectors, aviation history buffs, or vintage scientific instrument enthusiasts.Shipping & Handling:Item is heavy and contains sensitive precision instruments. It will be packed with extreme care, heavily bubble-wrapped, and double-boxed to ensure safe transit. Double-box shipping is factored into the shipping cost.
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