set/24477_16_objects/1 matches the site

public static Set Auction_Lot()
{
    var lot = new Set()
        .WithContext()
        .WithId("https://linked.art/example/set/24477_16_objects/1")
        .WithLabel("Set of Objects for Lot 16")
        .WithClassifiedAs(Aat.Term("300411307", "Auction Lot"));

    lot.IdentifiedBy = [
        new Name("Lot 16: Le Printemps").AsPrimaryName(),
        new Identifier("16").WithClassifiedAs(Aat.AuctionLotNumber)
    ];

    return lot;
}

• Role shortcuts AsPrimaryName, AsAccessionNumber and AsSystemAssignedNumber each add a single classification, with the AAT terms Primary Name, Accession Number and System Number.
• Terms outside the registry The vocabulary registry holds only the terms linked.art itself publishes, so a dataset's own concepts, places and people are written with Aat.Term, Tgn.Place and Ulan.Person, giving the id and the label.

var set = new Set
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/set/24477_16_objects/1",
    Label = "Set of Objects for Lot 16",
    ClassifiedAs = [Aat.Term("300411307", "Auction Lot")],
    IdentifiedBy =
    [
        new Name("Lot 16: Le Printemps")
        {
            ClassifiedAs = [Aat.PrimaryName],
        },
        new Identifier("16")
        {
            ClassifiedAs = [Aat.AuctionLotNumber],
        },
    ],
};

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.