Panther Model 120
The final incarnation of Panther’s big single. Introduced for 1959 and based on the 598cc Model 100, capacity was upped to 645cc with bore increased by 1mm to 88mm and stroke up from 100mm to 106mm. It was reckoned these changes gave an extra 4.7bhp (now 28bhp). Production peaked in 1963 at 329 in the year