This lens is in remarkably good shape for its age. It does have some internal dust, but the optics are free of fungus, separation and haze.
Function
Fully Functional
Warranty
Six months - used equipment that tests to specs
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This is a brass barrel lens marked with "Rapid Rectilinear 16x20". It is not marked with a focal length, max aperture, or brand. It is likely that a company such as Ross or Dallmeyer would have made a lens like this as a custom order for a customer who ordered this specific, simple engraving when they ordered the lens. While we don't know the exact focal length or aperture, it is likely that this lens was made as a portrait lens for ultra large format cameras and likely has a relatively fast max aperture for portraiture. This lens does not have a shutter.
This lens originally would have come with a set of waterhouse stops. These are now missing, although a new set of stops could feasibly be machined out of metal.
This lens comes with a homemade leather lens cap. It is missing its original waterhouse stops. This lens will require a suitable lens board and shutter for use on your large format camera.