AFAIK, they haven't
@ 1973
All of those qualities are relative. Aluminum is a good start. For formed sheet metal, type 5052-H32 is pretty common.
Galvanized sheet metal can typically handle temperatures up to 392°F (200°C) before it may start to warp. Warping may occur if the metal is exposed to temperatures higher than its annealing temperature, causing changes in its structural integrity. It is important to monitor the temperature to prevent damage to the galvanized sheet metal.
Besides a number of books published on Browning, and some of the gun collector forums (google Browning collectors) you might start with Browning. They have a website, and are still in business making very nice rifles, shotguns, and pistols.
To start you will need a piece of weatherproof sheet metal, assuming the sign will be outside. Depending on what size you have you may also need tin snips to cut the metal You will also need paint that can be used on metal outdoors to prevent rusting, screws to mount your sign and a drill.
12 gauge BSS were first made in 1971 and 20 gauge in 1972.
bend metal into spiky shapes
Browning began producing the Citori White Lightning model in 2015. It is a versatile over/under shotgun known for its lightweight design and classic aesthetics.
Mild soap and water is used to clean galvanized sheet metal. Using an abrasive cloth that will not scratch the metal can be used for dirtier areas. Larger areas can be cleaned with a soft brush and car washing soap.
To create magnet boards using materials like metal sheets and magnets, you can start by obtaining a metal sheet of your desired size and thickness. Next, attach the metal sheet to a sturdy backing, such as a wooden frame, using adhesive or screws. Once the metal sheet is securely in place, you can then use strong magnets to attach notes, photos, and other items to the board. Make sure to use magnets that are strong enough to hold items securely in place.
1942
Browning, Mid West Gun Works, Brownell's, are places to start.