The following is from StacksBowers February 2015 sale.
Undated Schuler Bimetallic Coinage Test Piece. Copper-Nickel Ring with Brass Insert. Plain Edge. MS-60 (Uncertified).
26 mm. 11.4 grams. Obv: Insert with a head facing left, wearing Phrygian cap of Liberty, the ring around inscribed EXPERIMENTAL / MODEL. Rev: Insert with an eagle perched right, the ring around inscribed R&D / PROJECT on the reverse, with additional Braille characters at left and right indicating the reverse side. An interesting piece produced by Schuler, the German manufacturer of the Schuler coining presses that are widely used in mints throughout the world. Though undated, this piece was acquired by our consignor in 1999. Schuler produces complex presses that are used in striking bimetallic coins. According to the firm's website, theirs is, "a press for hole-piercing, joining, coining, and separating…applicable as coin minting press for round, non-round, and bi-metal coins, as a joining press, hole piercing press, and as a press to separate ring and core in the case of bi-metal coins taken out of circulation for recycling." Research by Phillip Barnhart can be found on the Internet, and indicates that these bimetallic test pieces were struck in 1997 or 1998 by Shuler in their Michigan offices as demonstration pieces for the U.S. Mint and for exhibition at U.S. Congressional hearings. The test pieces had two purposes. First, to demonstrate the addition of Braille elements to coinage in response to concerns of the Alliance for the Blind, and to promote their own technology to produce bimetallic coins as the U.S. Mint was investigating ideas for a new dollar coin. It is believed that approximately 20 pieces were struck.
A second example, graded PCGS64, was offered in StacksBowers November 2020 sale and a third graded PCGS66 was in Heritage 7/21 sale.
Photo courtesy of StacksBowers.