Vintage(?) shoes

The navy blue shoes are Dolce Vita as far as I know, but other than that there's no size marked anywhere although I'm assuming their around a size 8 1/2 or 9. There's nothing on the bottom except dotted lines and the letters "DV." The other shoes are size 7 1/2 Daniella heels. I purchased both pairs at a small vintage store in Mississippi. I'd like to know how old they are and perhaps if they're worth anything at all. That's all the information I have, so if you could help in any way I'd appreciate it!