That chain guard was an all-purpose model that appeared on several types of bikes from several makers. I think it's the version with the extra mounting holes to accommodate various frames, including both ballooners and lightweights. It's not a bad chain guard and it's reasonably well-made. I've seen them as both factory and aftermarket items. You'd have to look at the mounting situation, paint lines, wear, etc. to determine if original to a particular bike. It looks off to me on that one, just going by the pictures.