The book I have says 1969 production was MY50396-MY50440 and then 1970 production was MY60473-MY60587 for the 3496 combine - grain. The serial number ranges do not appear to be consecutive. They look like batch builds. Unfortunately your serial number does not fit in these ranges but I'd guess it's either 1969 or 1970.
2155 1050 3-1000 950 900 707 706 705 GVIfwd GBD GTA 3-670 M5 5* 302 UBDsp UBED UB U UTS UTUrn MTA JS3 JS3roller 4* 2-445b/h 445brkbugy 335I ZBE ZAS ZTSwtrl JTU RTE RTIM 3RTI 2RTSwtrl RTN 3RTU BG V Motrac MT40 MY40 2-112 110H 108 2Uni's.