Goerz Berlin brass focusing loupe for large format cameras, from the early 1900’s. Magnification is approx 4x. Focusing it’s adjustable, it have a locking collar to set the focusing. It’s a museum piece, very nice conditions for it’s age over hundred years old, it does not show heavy signs of wear, brass finish is in great shape. Glass is intact without any cracks or so. It’s 2 1/2″ tall and main cylinder is an 1 7/8″ It’s a very rare collectible piece, I owned it for over thirty years, and I have never seen another like that. Zero feedbacks or less than twenty feedbacks.