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LCs, colors and spectral properties are compared to those of SN 2005bf and normal SE SNe. A bolometric LC is built and modeled with the SNEC hydrodynamical code explosion of a MESA progenitor star, as well as with semi-analytic models. The LC of PTF11mnb turns out to be similar to that of SN 2005bf until $\\sim$50 d, when the main (secondary) peaks occur at $-18.5$ mag. The early peak occurs at $\\sim$20 d, and is about 1.0 mag fainter. 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