No. Montblanc never offered two-tone pens of this kind, a burgundy upper half from the Le Grand range with a black lower half from the Classique range. Where a ballpoint turns up in this combination, two pens have been taken apart and their halves fitted together. The claim one occasionally reads, that the conversion was carried out “by Montblanc itself”, is untrue; factory specials of this sort do not exist.
That the parts go together at all is down to the threads being similar across the model ranges. It by no means follows that the result will work: Le Grand and Classique differ in length and internal dimensions, so the twist mechanism often fails to engage cleanly because refill and guide do not match.
Anyone considering such an offer should make a point of testing the mechanism for faultless operation and should pitch the price at the less valuable of the two halves. As a collector's item a hybrid like this counts for nothing. The sequence of numbers and letters with the country of origin on the clip says nothing about whether the parts belong together, since it relates only to the upper half.