Mamiya 645 Auto Extension Ring No. 2 No. 3

Please judge the condition from the photos.

Organizing my grandparents' belongings.
There are many items, so I am listing them little by little over time.
Most of the items belonged to my grandfather, who had many hobbies, so I do not have specialized knowledge. It will be difficult for me to answer questions. I will consider lowering prices starting with older items once I have listed a certain amount.