The imaged overprint is inconsistent with the overprints pictured from Siegel Auctions. Letters in the overprint pictured are not crisply defined and vary in size in contrast with the Darrah overprints pictured in the Siegel lot:
https://siegelauctions.com/lots.php...60&page_no=1Darrah overprints from 1913 are found on perf 12 stamps. The image stamp is from a late perf 11 printing. Scott 499 plate numbers range from 7322 to 14025 except for the outlier plate 5990 that went to press in 1922, the last full year of production. The plate number makes the stamp a very useful reference item for an expertizer.