We report the formation and structures of two new organotin-copper selenide clusters that were obtained in a two-step procedure. First, [((RSn)-Sn-1)(4)Se-6] [R-1 = CMe2CH2C(O)Me] is reacted with [Cu(PPh3)(3)Cl] and (SiMe3)(2)Se to form a bright-orange powder, the nature of which could not be identified in detail, yet a suspension of it in CH2Cl2 reacts with N2H4 center dot H2O to afford single crystals of two cluster compounds, either [(Cu3Sn)0-{((RSn)-Sn-2)(2)Se-4}(2){((RSn2)-Sn-2)Se-3}] (1) or [(N2H4)(Cu4Sn)-{((RSn)-Sn-2)(2)Se-4}(3)] [2; R-2 = CMe2CH2C(NNH2)Me]. Both are based on an intermetallic CuxSn cluster core (x = 3, 4), which is surrounded by organotin selenide units in different fashions. The results foster the assumption of a complex equilibrium to be present in according reaction mixtures.