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@bq
If it's Mangaloy 2001 it's a Tange trademark for their magnesium molybdenum double butted tubing. My blue Harry Quinn is made of it. It's more or less the same alloy as Reynolds 531, but thicker, and seamed rather than drawn. It weighs about as much as a 501 frame but is a lot stronger.
It's a nice lightweight steel. It might look very nice clearcoated, though on a lugged frame I prefer chrome or paint.