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.
NWT COACH LEGACY Double GUSSET Flap In Leather Bag 25361 Brass/Black Violet | eBay
Style Number: No. 25361. Style: COACH LEGACY Double GUSSET Flap In Leather PURSE Bag. Color: Brass/Black Violet. Classic turnlocks and a ladylike chain strap add pretty practicality and a touch of glamour.
www.ebay.com
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...
poshmark.com