Bushmaster,
The original Lyman Alaskans were pretty tough for their day, but the glass wasn't much and the "All-Weather" name came from the fact that they actually had turret caps, when many scopes back then had exposed adjustments. However, the Alaskan's turrets weren't sealed underneath the caps, and the rest of the scope wasn't sealed either.
They'll still work in relatively dry climates, and I've killed some animals with Lyman Alaskans here in Montana. But aside from nostalgia there's no real reason to use one.
