Arrieta models were determined by their engraving pattern. I have seen Arrieta models from their entry level Model 557 to their top-of-the-line Model 931 and every model between with the optioned rounded action. The one thing in common they had with an 871 was the rounded frame. The Model 871 and Model 06 were standard with a rounded frame, but an option with other models. Arrieta, being a custom gunmaker I'm quite sure could build you a Model 871 with a square action.
Shown below is Arrieta's highest grade offering with a rounded frame and 931-style engraving. If you want to consider it an 871 with 931 engraving you can, but you'll pay thousands of dollars more to get it.
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Wild Skies
Since 1951
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