I have the Spyderco Pattada and Extrema Ratio Resolza. Both are modern takes on the traditional Sardinian peasant's folder.
They share the same curved handle and blade shape. The modern ones use aluminum or G-10 scales instead of mostly natural materials in the traditional Pattadas. Also, much better staineless steel on the modern ones. The modern ones also have some kind of locking mechanism but the traditionals have no locks. Also, Spyderco's Pattada has a clip. Pattadas come in various blade lengths but around 4.5 inches seems most popular. Spyderco's is 3.9 inches and ER Resolza 4.8 inches. Both are quality made in Italy with N690 stainless steel. All are very light for their size since they're pretty slim. Both Spyderco Pattada and Extrema Ratio Resolza are priced about the same. ER Resolza has no clip. Spyderco Pattada is more practical due to smaller size, G-10 and clip.