It is interesting to see these two chronographs side-by-side as they show the evolution of the design over a period of 10 years.
The Ref. 4946 (left) was introduced in 1999 and made until 2002. The case measures 38mm x 13mm and houses the Cal. GP3370 automatic chronograph. The long curved lugs help it to wear larger than the case measurements would suggest.
The Ref. 49585 (right) was introduced in 2010 into the Classic Elegance line and was superseded last year. The new Hawk Chronograph now holds the place of sports chronograph in the GP range.
It is characterised by the enlarged “12”, the removal of “Automatic” and “Manufacture” and the addition of “GP” on the dial. The larger 40mm x 12.8mm case makes the watch a little bolder on the wrist. Inside eats the Cal. GP0337A flyback chronograph but it is now hidden behind a solid case back.
Both watches provide an attractive vintage-styled design with modern reliability and dimensions. Girard-Perregaux at their best.

And a change of light shows how the dials come to life. Beautiful.

Andrew
Great comparison, only side-by-side one can appreciate the subtle differences. I have to say, I still love the 4946. In the comparison pictures it nicely shows how the crystal is slightly larger compared to the case and it also has the case polished. To me at least it looks it has more harmonious proportions even it is smaller at 38mm. I think the differences on the dial on the other hand are miniscule and make no material difference.
It would be nice to get an overview of the variation of the 4946 model. I believe there are numerous Rallye Monte Carlo editions and an edition called “Colorado Fly-back (4958)”. If anyone has a full overview with pictures…
CC