Unidentified publisher, n.d.(ca.1885). Plate 5884.
Public Domain [tag/del]
Opus number according to Biographie Universelle des Musiciens as scanned by Google.
1844 publication of a (this, I think) nocturne mélodique by Willmers: Publication noted in the Bibliographie de la France 1e série, 33e année (47e de la collection), Nº 42, 19 Octobre 1844, p.552, r.202. Publisher given as Richault. Plate of that Richault edition is 6960.R: BNF Catalogue Entry. (BNF lists 5 nocturnes by Willmers in its collection, his Opp.12, 40, 41, 55 and 62, published by Richault except for Op.55 (Le Rêve) published by Lemoine. Only Op.12 is called Nocturne mélodique in its first edition, though the posthumous publication above could of course have had a different title when the work represented therein was first published, as often happens.)