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It would depend on any secondary mod. The highest I have seen is 63 but 69 sounds right for highest possible. Vita or high elemental damage mods would push it higher than 42. You can get that with other things such as +max damage like so.
Shogukusha's Grand Charm of Maiming
Keep in Inventory to Gain Bonus
Required Level: 63
Item Version: Expansion
Item Level: 90
+4 to Maximum Damage
+1 to Martial Art Skills (Assassin Only)