Have you tried the free new PhotoDater tool on MyHeritage yet? We just tried it for the first time and were pretty impressed.
We tested it on a few and did not find any errors. This photo is the confirmed class of 1909 in Riverton, Iowa. The PhotoDater tool said 1905. Not bad!
![class photo from 1909](https://static.wixstatic.com/media/de88f3_a8650a78cf3e4652bf16e86bb1fb76d0~mv2.jpeg/v1/fill/w_147,h_91,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/de88f3_a8650a78cf3e4652bf16e86bb1fb76d0~mv2.jpeg)