It's an early West Wall as Brian says ... later ones were made of zinc, yours is a bronze/brass metal. The yellow ribbon is also (in my experience) more commonly found on the early awards.
I agree with the others that yours is an original Westwall Medal. However, it does not look to me like an early issue. It looks to me like yours is a later type, struck from zinc, but with a nice bronze finish. I would also venture to say that your particular medal was produced by Wilhelm Deumer in Lüdenscheid. No, you will not find a maker marking on the suspension ring, but it has all the traits of a Deumer.
I believe I see spots of gray metal showing in the circled areas below. I believe this confirms that the base metal is zinc and not tombak-bronze or brass. And I see many other worn areas on the high points which appear to show gray metal. The white cleaner residue makes evaluation a bit difficult, but I'm pretty certain we are looking at a zinc-based medal.
Here is a composite showing three Deumer-made Westwall Medals. All three of these examples are zinc-based. These Deumers have a very good bronze finish that holds up well over the years. With a casual glance these could pass for tombak-based examples but they are in fact zinc.
And compare the very distinct detail of the earthworks on the two medals. The detail is identical and IMO only a Deumer-made Westwall Medal looks like that.
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