Instant purchase OK. This is a junk item as the operation has not been confirmed. There is age-related deterioration. I do not have expert knowledge of cameras, so I may not be able to answer detailed questions. Please purchase only if you are knowledgeable about cameras or can perform maintenance yourself, and are satisfied with the item. (Mold and corrosion present) This is an Olympus OM mount mechanical single-lens reflex camera, the M-1. Due to a naming issue, it was later renamed the OM-1, and it is said that only about 5,000 units were produced. The specifications are the same as the OM-1, but there are subtle differences in the details of the exterior, and it is also said that the shutter feel is slightly lighter. Please check the condition in the photos. All accessories are shown in the photos. I have tried to provide as much detail as possible. Please feel free to comment if you have any additional requests.