Check the listing for details. Rare Hard Rubber Top Hat Block Mold Insert Millinery Vintage Form. Listed at 74.99 USD. This product is a rare hard rubber top hat block mold insert, designed for millinery use in the vintage form. The mold is likely to be a unique and sought-after item for collectors or enthusiasts of industrial molds and antiques. With its distinct design and material, this top hat block mold insert could be used for creating custom hats or as a decorative piece in a collection. All the inserts , molds, tools etc, that I have listed came out of the historic F&M hat factory in Denver, Pennsylvania. All can be cleaned up more, they have been sitting on shelf’s in the closed factory for years and I just wiped the dust off them.