If they were Attwood, it would have the name embossed on the side. The stepped feature in the middle makes me believe they Are Tempress Fish-On.
I put on my first set of Fish-Ons in about 1982. Have had them on every boat since. In fact, when I sell a boat I remove them and put them on the new boat. So, some are 30+ years old. Never broke one yet. We use them for Musky trolling.
The downside is they don't float. So don't drop one overboard.
Best rod holder I ever had.