IMO this is not a Hammer & Sohn. It is the type that looks very similar, but definitely not a "textbook" Hammer & Sohn. The badge that started this thread is the questionable type that is frequently confused with the Hammer & Sohn. I am still not certain of this type, but many have called it a fake in past discussions. Please see my postings in the linked thread, beginning with post #7.
Questionable type on left and "textbook" Hammer & Sohn on the right. Way too many differences here. Look at the cutout areas and the overall outlines of the badges.
The badge in question (top) has a sheet metal hinge with a wider base flange that covers the cut-out area above the eagle. The single rivet has a nicely-domed head.
The Hammer & Sohn (bottom) also has a sheet metal hinge, but with a narrower flange that leaves the cut-out area above the eagle visible. The single rivet is more flattened rather than domed.
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