File:Trinity chapel at Fort Delaware built in 1863.jpg

Summary
This image comes from a postcard, which dates to the year 1907. The digital file is from flickr and has been released to the public domain by the owner as stated on the flickr URL: https://www.flickr.com/photos/combatcamera44/3753321470/.

Since it is a postcard from 1907 it is also a public domain image. (Published before 1923.)