Lens extension and retraction. Aperture blades opening and closing when attached to the camera body. The above functions have been confirmed. I am unsure if there is any mold. It doesn't appear to have any at first glance. I couldn't confirm it definitively because the aperture blades close when the lens is detached from the camera. The lock release button is missing, so it can be released with a thin object like a flathead screwdriver. I have selected "EF mount" for the product category, but this is an FD mount. ※ Please note that this is a used item, and I do not possess the specialized knowledge of a camera store. Therefore, there may be oversights. Please assume that anything not mentioned has not been confirmed. I cannot provide support or warranty for any changes in condition or malfunctions after receipt. Please only purchase if you can accept this. Returns are not accepted as this is a used item.