Rusan Adapter ARM 52-64 with M52x0.75 internal thread, light signs of use

For sale: a Rusan ARM52-64 adapter with a 52x0.75 internal thread, a standard interface between the scope objective and a thermal imaging clip-on device.This adapter is for 56 mm objectives. Careless as I am, I bought two and only need one. Please measure the outside diameter of your scope objective before bidding. It will save you a headache. The adapter is not new, but it is in perfect working order. It has minor signs of use. See photos.I’m selling this adapter privately, so there is no warranty, returns, or guarantee.