Vacheron Constantin

Please help to date the year of production for this chronograph

Hi All,

Happy New Year 2005! and this is my first watch of this year.....It's the vintage chronograph ref.4072 in rose gold, 34.5mm snap caseback and it has the 2 tones rose color dial. The movement no. 431.3XX and case no. 276.5xx, does anybody know what year was this watch production?

Thanks in advance,
Danies