Hugo Meyer & Co 310mm f3 Atelier-Schnellarbeiter 13 No 4
Sehr alt, sehr schön! KING OF PETZVALS! Covers 8x10 for portraits! Aperture is smooth. It has some dust/paint particles inside which is normal for a lens like this of this age. But over all it's in good condition. This is the RARE version -- it's little brother, the 270mm is much more common.