The 1858 issue would have a clearly visible large curly "2" as watermark. Wove paper without watermark suggests that it's the 1865 issue (Scott 17, SG 16). Beautiful stamp, shame about the damage.
Indeed, in my catalogue it would be Scott 27 for the 20 but I see your point. If Scott 17 is unwatermarked, as I believe the catalogue would indicate, then Scott 27 would be the correct designation as the stamp is definitely a 14 1/2:15 perf and does have a watermark, but not, seemingly the clear one that would define Scott 3. So by process of elimination it would be Scott 27.
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