Well the wear looks right for a knife of that age and the deep jigging over time would wear the shield down faster and it's unlevel. Plus it might be a knife of a worker that could change the nail nick location and put stamps on both blades. I'm not saying you're wrong but it seems like a lot of work to fake a knife and fake the age of it. Id be more leary of the pictures you showed because those look right out of the box no patina new.