Here is a verifiable piece of US Army Signal Corp and Weather Forecasting history. General Myer died just a few years later. I found references to this weather case on several websites. The door glass looks to be original with a lot of waves in it.

NOS NEW ZOLLNER SIGNAL SYSTEM UA 115 NT DC AUDIBLE SIGNAL ALARM SPEAKER 24V DC. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “the_nautical_store” and is located in this country: IN. This item can be shipped worldwide.

• Original/Reproduction: Original

Antique Barometer – L. Casella, Maker to the Admiralty, London. Also marked “Compensated 2631″ “For Issue” No. This item is missing minor wood moulding on front left side. Barometer measures approximately 10″ x 7 1/2″ x 2 1/2. See photos for condition. All sales to U. The item “L. Casella Barometer Signal Service, U. S. Army (Circa 1870 90)” is in sale since Tuesday, June 8, 2021. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “jncollections32″ and is located in Garfield, New Jersey. This item can be shipped to United States.

NOS NEW ZOLLNER SIGNAL SYSTEM UA 115 NT DC AUDIBLE SIGNAL ALARM SPEAKER 24V DC. The item “NOS NEW ZOLLNER SIGNAL SYSTEM UA 115 NT DC AUDIBLE SIGNAL ALARM SPEAKER 24V DC” is in sale since Thursday, April 11, 2019. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “the_nautical_store” and is located in BHAVNAGAR, GUJARAT. This item can be shipped worldwide.

• Original/Reproduction: Original