What is a 1914 model automatic 32 pistol made by Beistegui hermanos-eibar worth?

Blue Book of Gun Values

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It depends on the condition and whether it has the markings for a pistol used by the French military in WWI.

In general, these and other Eibar region "Ruby-type" pistols currently (late 2010) sell for about $100-$300. Beistigui Hermanos (Brothers) was a well-known firearms manufacturer, but in the US few people collect Spanish handguns.

(Eibar is a city in the Basque region of Spain, an area long known for firearms manufacturing. Dozens of small Eibar-area firearms manufacturers made almost a million Ruby-type automatics for the French military in WWI, most in .32 ACP / 7.65mm. Most of these companies went out of business by the end of the Spanish Civil War in the 1930s.)