Here we have a Chromed polished washer for the right hand pivot point of 1973-1985 BMW Airhead models. Also used on earlier models (R25 - R69S).
It is Part No 16 on the attached diagram.
I've a few of these and you'll get one and the same condition or better than the one pictured.
Last picture shows a new one for size purposes (not one I have for sale but all I have are the same size).