This frame is handmade by an independent "amateur" builder (Jure Berk) out of Slovenia. This is his fourth prototype frame which utilizes carbon nano-fiber technology; hence the PT4-Nano designation. As you can see, there is nothing amateur about his work. He also does great work with custom integrated seatpost - saddle combos and other carbon fiber parts.
Shown here with SRAM Red and Lightweight Ventoux wheels. More details here.