This was originally intended to be a companion thread to the one I posted yesterday. Since that one was not understood, I considered not posting this one at all. However, I will plod on in hopes that someone may gain something. The photos in the previous thread showed coins with obvious strike doubling: flat, almost two-dimensional, shelf-like secondary images and reduced metal on the primary images. This coin has what looks more like die doubling on the first two date digits (the secondary images look more 3-dimensional). Searching reference materials for a doubled obverse on a 1920 cent leads to a dead end. Other clues include flatter looking doubling on the bow tie and on the "Y" in LIBERTY. The conclusion is that this is a more deceptive example of SD.
One of the indicators that you can use, is to see whether there is notching on any of the devices. Die deterioration doubling, machine doubling, etc. won't have it. Not always a guarantee of a doubled die (especially when the doubling is minor eg. fattened devices) but just another thing to look for.
