The range of alloys used is spectacular: weathering steel for aging, marine-grade light weight aluminum for weight savings

https://www.scribd.com/document/1041492153/The-Legacy-of-Hand-Fabricated-Metal-Personalized-Leader-Boxes-Designed-to-Sustain-a-Century-231508

The variety of alloys utilized is spectacular: weathering steel for aging, marine-grade aluminum for weight financial savings, and duplex stainless for deterioration resistance in extreme climates.