Fuel tank question

Hello,
Just wondering if anyone knows why Husky made tanks out of Aluminium and steel ? Why didnt they stick to one type of metal or did it just change over the years depending on the fashion at that time ?
Cheers !

My guess. Steel is cheaper, easier to make and less dent prone. Alloy lighter but more difficult to make so used on higher performance models.

Aluminum is made electrically. Eventually inert gas shielded, many chemical advances. Same with plastic or other synthetic material. They also are making a price point and have varying degrees of competition in the marketplace as time goes on. I assume the fuel tanks were steel from 1903 or whatever date you choose until my guess is somewhere in the 70's

im guessing early 70's when performance was becoming a marketable option

Some European countries did not allow plastic tanks

Yes, no cars here ! We ride only horses and donkeys.