The 1960s are a decade of great designs and my favourite vintage watches mostly date into that decade. For Girard-Perregaux it was a thriving decade with many great designs and great economic success. Here is a pair, one Gyromatic in steel with a crosshair dial and one yellow gold (plated) time-only. Both have around a 33-34mm case and straight lugs. Timeless classics that look fresh even today.
Gyromatic Crosshair: Reference 7372
Manual Wind Dress Watch: Reference 7571