Barrel Markings

[Jack Flash]

Can anyone tell me what these mean? I'm trying to date my older Wingmaster. Serial number is S521**1V

[Lakeishlevin]

Those look like standard proof and inspector marks rather than anything tied directly to the serial. The “REP” indicates Remington proof, and the letters around it usually point to barrel inspectors or date codes. You might want to check the Remington barrel date code chart—matching the two-letter code there will give you the production month and year.