I believe these are all low rings of the Leupold/Redfield design.
Top set is blued and the screws come in from the bottom. One screw is missing.
Middle set is matte and it appears to be standard 2 screw (Leupold pre-L logo?).
Bottom set is blued four screw Redfield (?).
Due to shipping costs not interested in onesie-twosie. Will sell for $25 shipped CUSA via USPS in padded envelope.
Need an 'I'll take it' and a PM with all contact info.
https://imgur.com/a/6mls50v