No, FRANCE on the clip is no argument against authenticity on a Bohème with a metal body. The metal overlays of this line were made for Montblanc in France by Cartier, according to collectors roughly between 2005 and 2010, though the exact period has never been pinned down. That is why the metal versions of the Bohème often carry FRANCE in place of the usual GERMANY. The serial number sits on the clip as it always does, so the two markings are consistent with one another. A final judgement, however, calls for detailed photographs or the pen in your hand.
The gold-plated Bohème is not a limited edition but belonged to the regular range. Production was accordingly not limited in number, and Montblanc publishes no reliable figures; anyone hoping the country of origin makes the pen especially rare will be disappointed. Its second-hand value is therefore governed, as with other series models, by condition, by whether case and papers are complete, and by demand for the particular decoration and for the execution of the gemstone in the twist knob.