It looks like a well executed, modified stock "low" seat that's been extended in the back.
Translated description, note the 'amended bench'
- Honda CB 1100 Cafe Racer conversion - for example the following modifications were made: ,-m - Blaze Cone LED front turn signals - m- Blaze ICE LED rear indicators - amended bench - LSL handlebar - short LSL Clutch and brake levers - modified seat - short tail with LED tail light - much more - conversion costs about 2000 € ! - Demo vehicle , accident free, full service history , German model by the dealer , without flaws or quirks , 1A state , federal shipping from 159,00 € (delivery approx 5-10 working days ) , possible trade Honda financing possible 50:50 - opening times - Mon-Fri 09:30 to 18:00 and Sat 10.00-14.00 clock ---- We are authorized Honda dealer , and Kymco Quad dealer in Bautzen and offer a wide range of new and used vehicles from Honda , Kawasaki, Suzuki, Yamaha and triumph . To the brands we sell ATVs, the Kymco and Triton . - We are constantly looking for used vehicles of all makes . Fast turnaround guaranteed! - In our showroom we also offer a wide range of helmets of brands Shark , LS2, G- Mac , Bandit and O'Neal on , as well as clothing from Macna , Bering , Modeka , IXL and etc. - MOTORCYCLE CENTER BAUTZEN --- YOUR COMPETENT HONDA & KYMCO AUTHORIZED DEALER FOR NEW AND USED MOTORCYCLES BAUTZEN
amended bench must be something else, it says 'modified seat'