USAAF WW2 era type seat parachute model type AN-6510

This is a USAAF WW2 era type seat parachute model type AN-6510 as commonly seen in Europe and Pacific worn by fighter pilots and some bomber aircrews.
The A/N term means it was a USAAF / US Navy common type parachute design, thus chosen to enhance production abilities and reduce costing in the US military program which was spreaded across many manufacturing factories.

Aircraft types this is suited for are P-51 Mustangs, T-6 Harvards, P-40 Kittyhawks etc.