Can anyone identify the gas tank on this? Much appreciated

https://i.pinimg.com/originals/ef/62/7f/ef627f576914d28d1f9adefa217266de.jpg via /r/CafeRacers https://www.reddit.com/r/CafeRacers/comments/b6k6xs/can_anyone_identify_the_gas_tank_on_this_much/?utm_source=ifttt