Stamp box directory
KODAK stamp box: dates and marks
From about 1950 on, most real photo cards simply say “Printed on Kodak Paper” — the mark of the modern era, and still in use.
Standard mark
1950-present
Ranges cross-checked across: the2Buds.com chart, as republished by Sports Collectors Daily, 'Dating Vintage Real Photo Postcards'; SABR Baseball Cards Research Committee, 'Dating and Authenticating Real Photo Postcards' (2017); Postcards Everywhere collector chart (2010); Playle's Directory of Stamp Boxes (playle.com, frozen reference; marketplace closed 2020); Playle's detailed stamp-box directory pages (playle.com/realphoto/photoa.php, photod.php; image-keyed, contributor-verified; fetched 2026-07-18). Approximate by nature — see methodology.