Looking for any information on a P&S lens. Engraved on the barrel is:

P. & S. Doublet
Series I, No. 1 1320

The lens is mounted in an aluminum barrel with a maximum aperture of F6, minimum f32. Is this a petzval design? The front element has two strong reflections while the rear element has two strong reflections and one weak reflection.

Thanks in advance,

Daniel