i happen to own a '95 model custom TI/steel lugged and bonded frame. top, down, seat and head tubes are TI, rear triangle is 753 reynolds. it was made in Newark Ohio by Franklin Frames. as mentioned the lugs are custom designed to maximize surface area for the bonding. they were probably part of the TI tube/lug set bought by the builder for the frame.

despite looking good and getting some attention, etc, it's NOT my favorite bike. too flexy, not the builders fault...

BTW, after about 30,000 miles (not to mention fifteen years) i recently had it rebonded due to a creak in the bottom bracket area. the builder did it gratis. nice of him i thought.