Update 08/14/2025 – This article was amended to clarify that Eddie Van Halen’s actual ‘Number One’ Kramers were the 5150 and his 1984 back-up guitar. Eddie Van Halen”. “This guitar is known as the 'Kramer Ad Guitar' amongst Van Halen guitar nerds,” says Gill. Importantly, the back of the headstock features an inscription that reads '#1 Edward Van Halen model'. Though this guitar was the first Van Halen Kramer, it wasn't the guitar great's 'Number One' Kramer, per se – that title belongs to his famed 5150, and 1984 back-up guitar.