With these four Gainsbourg-covers, I think I've posted every Dutch Serge-reprise there is. Bar one: a rendition of L'Accordeon by the Jopie Jonkers Group (link). But I think their version doesn't differ that much from the 1984-cover by De Ploegadoers, a Dutch folk band from Liempde.
The one I was most curious about, was by organ-player Frans van de Borg, a northener who made one album (link) containing church music, Booker T-songs, a piece by J.S. Bach, and Je t'aime moi non plus. A pretty standard muzak-y version, think Paul Mauriat and the like.
A real surprise was the album Hitparade from the Caramella Zandvoort (link). According to the liner notes, the club in beachside Zandvoort was the Dutch counterpart of the Hamburg Star Club, and Paris' Club St. Germain. The 1965-album contains smooth jazz and easy listening, played by Ger Dijkshoorn Kwintet, Holand Kwintet and singer Ingrid Spaak. She sings two Gainsbourg-compositions, Poupée de Cire (orig. by France Gall), and O, O Sheriff (orig. Petula Clark). Not earthshattering, and with an accent, but nice nonetheless.
Find other posts about Dutch Gainsbourg covers here, here, here, here, here , here, and here.
May I remind you that after summer, GainsNord is released, a compilation featuring old and brandspanking new SG-covers by Dutch and Belgian bands.
Ingrid Spaak - Poupee de Cire, Poupee de son (video of orginal version)
Ingrid Spaak - O, O Sheriff (video of original version)
Frans van de Borg - Je t'aime moi non plus
De Ploegadoers - L'accordeonist (video for original version by Serge and Philippe Clay, and here by Juliette Greco)