The question I have is whether the rear rim has ever been replaced. Generally speaking, rear rims wear many time quicker than fronts. Most people use their rear brake more often than the front, and the rear wheel is subject to road dirt and grit thrown up by the front tire towards the bottom bracket and rear wheel. I have worn out several rear rims riding in wet and dirty road conditions during the 25 years that I was a 8,000 km per year bike commuter. I once wore out a front hub, but the rim was still in pretty good condition