More than 110 U.S. post offices in or near the path of Monday's total solar eclipse are offering special post marks.
"The commemorative postmarks will be applied to envelopes, cards or any other items bearing First-Class postage stamps, including the Postal Service’s Total Eclipse Forever Stamp issued last month," the U.S. Postal Service (USPS) said in a press release.
Spokesman Mark Saunders said the postmarks will be unique in some locations, while most will use the one designed by the national office. He added that some post offices plan to use the special postmarks before and after the eclipse, while others will just use them on Monday.
The USPS created an interactive map that pinpoints all post offices within the path of totality.
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Earlier this year the post office issued heat-sensitive eclipse stamps.
Click here to see a list of some of the post offices offering the special solar eclipse postmark.
The Associated Press contributed to this report.