While his achievement may never be confirmed as an official world record, Colin Smyth will always look back and be satisfied with what he has done in the last 51 years at the Rotorua Marathon.
Smyth, 76, completed his 50th consecutive Rotorua Marathon on Saturday. It is a feat which many are speculating to be a world first at any marathon around the world.
Athletics New Zealand said it was more than likely a world first but the records were simply not there to verify it.
Smyth, originally a top runner, has never missed the Rotorua Marathon since it began in 1965, and has been walking it for the past 10 years because of a knee injury.
Lung troubles meant he could do very little training in the build up to this year's marathon, so he chose to start early on Saturday to give himself plenty of time to get around Lake Rotorua for his milestone 50th.