ADK, I want to gentle, but it is important to see the ENTIRE mail piece (including the back side if there are any postal markings there). While that may not seem important at first, there are frequently clues to identification - or features of tangential interest to the postal historian, beyond the basic identification of the stamp, which could be significant.
That said, the cancel date in April 1911 could easly mean either 331 or 374. Both catalog numbers have essentially the same modest value and most collectors would not bother to ruin a cover with a nice flag machine cancel just to confirm the exact identity, and would be content to label it as "either 331 or 374, depending on watermark" and move on.
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