The specimen offered here is an unidentified brachiopod in shale matrix rock. It was recovered from a Devonian (approx. 358 to 420 million years ago) deposit in the Catskills mountains of New York, USA.
The exact species of brachiopod has not been determined - I lack the expertise to identify it authoritatively.
Refer to the photos. The black centimeter cube is shown for scale and is not included. You are purchasing the specimen shown. It measures approx. 2.5 inches by 1.5 inches (64mm x 38mm). Your purchase will include an ID label.