1960s snap tab collar french cuff Eaton’s Mod James Bond Classic Sanforized 50s

Really awesome shirt - with vintage celluloid Pearlized buttons sometimes called pearlite. This shirt is meant to be worn tucked as the buttons don’t continue past the waist. French cuffs which can be used only with cuff links add an air of fanciness to this piece along with the snap tab collar which uses a Klikit Rau snap. Could easily be from 1950s but is almost guaranteed not older than 1969. Measurements flat: 21” chest 16” shoulders 9” arm opening 4” cuff opening 33” back length Labelled as a 15” collar which seems accurate.