A friend is interested in a BLNE 12 marked "Pidault Sucr. Paris" on the left barrel and "Houllier-Blanchard" on the right. It is a field grade gun with straight grip, splinter FE, and DT, and a case colored action with light border scrolls (well done). Has 27" metric length barrels and a swamped rib. He didn't give me all the markings but here's what he had:

Belgian crown over
E
LG

proofs on reciever water tables, a rhombus lozenge with 12 over C inside it , a crown over PV, a marking "d = m/m," another marking P1K416. One barrel flat marked 65/20.6, another 17.3 and 10.3. He says that the barrel flat markings are fainter than the water table markings making it appear that the barrels may have been re-finished long ago.

Any idea who actually made this gun (which I assume was a Belgian gun sold by a French armeury in Paris)? Does the 65/20.6 marking indicate 65mm chambers?