The regular dies trial piece without motto, struck in copper. To our knowledge, there are no confirmed examples. This may be a misdescription or underdescription of J450/P522 which has the motto "In God We Trust" on the reverse. Examples of such poorly cataloged listings include lot 810 in E. Cogan's 9/1869 sale and also lot 1370 of E. Cogan's 10/1875 Colonel Mendes I. Cohen sale.
Image is of J450/P522 with the motto removed and is courtesy of Heritage.