It appears that numista has marked Aluminum 1 Liras 1968-2001 years (N#2615) as it was in BU while it was not, several catalogs shows only UNC value and no BU value for example:
Is it Numista error or am I missing something. I have several of these liras in my collection 1970 and 1982 ones.
Catalog used: Standard catalog of world coins, 1901-2000 Krause 2012
BU and UNC are just statements about the condition, not different manufacturing techniques. I would expect any modern uncirculated coin put in a set by a competent mint to be BU.