object/coppa/1 matches the site

public static HumanMadeObject Coppa_1_Unknown()
{
    var coppa = new HumanMadeObject()
        .WithContext()
        .WithId("https://linked.art/example/object/coppa/1")
        .WithLabel("Coppa Amatoria");

    coppa.IdentifiedBy = [
        new Name("Coppa Amatoria").AsPrimaryName()
    ];

    coppa.ProducedBy = new Production()
    {
        CarriedOutBy = [
            new Group()
                .WithId("https://linked.art/example/group/unknown_italian")
                .WithLabel("Unidentified Italian")
        ]
    };

    return coppa;
}

• Role shortcuts AsPrimaryName, AsAccessionNumber and AsSystemAssignedNumber each add a single classification, with the AAT terms Primary Name, Accession Number and System Number.

var humanMadeObject = new HumanMadeObject
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/object/coppa/1",
    Label = "Coppa Amatoria",
    ProducedBy = new Production
    {
        CarriedOutBy =
        [
            new Group
            {
                Id = "https://linked.art/example/group/unknown_italian",
                Label = "Unidentified Italian",
            },
        ],
    },
    IdentifiedBy =
    [
        new Name("Coppa Amatoria")
        {
            ClassifiedAs = [Aat.PrimaryName],
        },
    ],
};

Generated from the object the example builds: every property that is set, as object initialisers, with the vocabulary constants where a term is in the registry. The fluent helpers are a convenience, not a requirement; this form and the one as written produce the same JSON.