Its a walking heel, which tend not to survive as much as fashion (high) heels, probably because they were more worn than high heels and worn out, but they are misleading because they make the shoe look earlier than they are - the toe cleavage is the newest feature of the shoes, but also that slightly squarish toe shape is typically late 40s, and the use of black suede is also typical of the late 40s - early 50s.