This tie came from @vintageprl who, from time to time, sells high quality vintage Ralph Lauren through his Instagram account.
It's just over 4" at its widest and is labelled Neiman-Marcus, a store founded in Dallas Texas in 1907 and which started to stock Ralph Lauren products in the late sixties (starting, I believe, with ties) and still sells them today. I don't know the date of this tie, but would guess seventies.