Up for sale here is this arm rest from a Marantz 6300 turntable. This is in great condition but the clip and presumably the pin that holds on the clip are both missing. You can get a reproduction clip on eBay. Please see my pictures for details.
US shipping and handling is $5, and international is $18. If you have any questions, please ask.
I have lots more Marantz 6300 parts listed--feel free to take a look! If it's not listed, I don't have it.