RAF High altitude Smiths Altimeter Mk19A Supermarine Spitfire??

Supermarine Spitfire PR Mk XIX. ✔ Smiths manufacture. Was RAF issue. One screw and bolt missing on bezel. ✔ 60,000 ft high-altitude spec. ✔ A.M. marking. It does not identify a specific aircraft. You now have multiple WWII authenticity markers.