That's Abraham isn;t it? I'm of the school of thought of the Angstadt family dude who wrote that KRA article a bunch of years back - I think most of these AA or A Angstat rifles are Abraham, not Adam. At least not the older b. 1740 Adam. He made a darned airtight case in that article.
The rifle originally discussed here I think is deceptive in that the carving begs to be dated earlier, ca. 1780s or 1790s, but frankly I would date it to around 1800 or maybe even a bit later. JMHO.
Rich that 4th one down in your photos - now THAT is an Angstadt masterpiece.