Do you have pictures or additional information on the painting on the rudder to identify LUT II?
G7a (T1) LUt II: 100mm high green text "L II" on both sides of aft-section + green band on rudder.
G7e (T3a) LUT II: 100mm high green text "L II" on both sides of aft-section + 45mm wide green band on rudder.
See also attached drawing from the german LUT II manual.
How the new colours, for the G7a/T1?
The colour on the head looks more like bronze than the previous one (there were both painted and unpainted bronze- and steelheads though, but those painted were light grey). For the body it is more correct (unpainted steel). This goes for the G7e torpedoes as well. See also other comments on the attached drawings.
I have also added some info from german manuals describing the LUT I markings for the T3 torpedo, as well as the different markings for T1 torpedoes indicating if the torpedo had starting gear and/or a strenghtened engine installed.
I know they had several other markings (coloured stripes on the aft-section indicating different versions of the G7e), but so far I haven't been able to track down descriptions of these.
Most torpedoes also had two painted stripes on the airtank (G7a) / batterycompartment (G7e) indicating the center of gravity for an "empty" torpedo without head (see example from attached photo).