I happened to catch a BBC special on the murders and it seems the French authorities are convinced the murder weapon was a Swiss Army luger, apparently largely because the caliber was 7.65 Parabellum (.30 Luger). One British firearms authority, Philip Boyce, is quoted as saying the ammunition must have been stored for decades or 'specially produced' as it hasn't been available for many years.

This is nonsense isn't it? .30 Luger ammunition is available new today from Prvi Partizan, Fiocchi, and others. As to the gun - there are Browning Hi-Powers, SIG P-210's, Walthers, and others available in this caliber. Unless the Swiss Army Luger marks the brass in a particular way, I don't know how they can say with certainty that it was this gun (without having the gun of course).

Maybe someone can enlighten me?