I. Allegro maestoso
||Madrid: A. Romero, n.d. Plate A.R. 2569.
||Editing: Resized, Cleaned, Cropped, Restored & Improved: Printing format A4
Parts in the possession of the Danish Libraries @ Arhus & Ballerup. See WorldCat.
This is not his only piano concerto, by the way; there is also a Concerto symphonique by Mayer, op.89, parts to which are in the Fleisher Collection (Free Library of Philadelphia).
Published by Lemoine in 1844 according to BNF. BdlF may confirm this - see Publication noted in the Bibliographie de la France 1e série, 33e année (47e de la collection), Nº 32, 10 Août 1844, p.419, r.98. (described as Grand concertant pour piano, avec accompagnement d'orchestre.)