`: Just mentioning that this very same photo is again the subject of confusion. All IS-1s had the ``broken`` nose, that is, the stepped nose with the openable driver's vision hatch. IS-1s also had the narrow mantlet, as did early IS-2s. Even early IS-2s with 122mm guns had the narrow mantlet. This tank has both the wide mantlet and the smooth nose without a hatch, obvious features of an IS-2.     `