Like this.....
Not vintage, but Coach made a Legacy Gusset Flap bag 25361 (circa 2013) that has a front flap with a double turnlock, see the link below.
Here's one listed on Poshmark that is much cheaper but it is missing one turnlock although that could be replaced:

Coach Double Turn Lock Legacy Shoulder Cognac Bag
Shop lindseyhart's closet or find the perfect look from millions of stylists. Fast shipping and buyer protection. Flap closure with turnlocks. Gold metal hardware and gold chain. Cognac/tan/brown color. Crossbody. Missing one turnlock. Small light spot on front and back. Light wear on inside...
