There are two copyright entries in 1931 listing Steven Rebeck as sculptor of the "Rock of Notre Dame" (Knute Rockne - legendary head football coach of Notre Dame from
1918 to 1930)
One copyright entry is by Consolidated Iron & Steel Co., Cleveland. #3455 listing
Rebeck (Steven Augustus) Sculpture:
Rock of Notre Dame. [Irregular shaped representation of rock bearing head of man and lettering in relief] © 1 c. May 13, 1931; G 6408.
Library of Congress Copyright Office: Cataloge of Copyright Entries, Part 4, Works of Art; 1931 New Series Vol. 26 No.2 page 81 (bound with 1930)
Admitting some speculation here, the object may be this:
MEARS Auction #24, ending March 26th, 2011 included 1930's bookends of "The Rock of Notre Dame" engraved against an image of a mountain. The title is in relief near the base.
image from MEARS Auctions, used with permission
An auction of the same item on another site described them as iron about 6 inches tall. Another auction described it as a door stop of around 3 lbs, iron and painted gold. All of these resemble a partially visible sculpture on Steven Rebeck's Studio shelf (below) and at a considerable sideways angle. (Sorry for the degraded quality--greatly zoomed in). The general contours match, however, suggesting the above is Rebeck's work.
The other copyright entry is by Trau (Clarence A.) Cleveland. #6469
Rebeck (Steve) Sculpture:
Rock of Notre Dame. Bronze plaque.[Head of Knute Rockne superimposed on a football] © 1 c. July 23, 1931; G 6626.
Library of Congress Copyright Office: Cataloge of Copyright Entries,Part 4 Works of Art; 1931 New Series Vol. 26 No.3 page 172 (bound with 1930)
Any information on this item would be very much appreciated.