Possible age of this piece?

I bought this as a squash blossom, but on further research, found that it’s called a corn blossom necklace. Is there really a difference? And about how old would you say this is? There are no hallmarks on it anywhere.

<img src=/uploads/db3169/original/1X/35ac8fc6098c0e5eeef7bebd210b792035cc0628.jpg">

<img src=/uploads/db3169/original/1X/0240f0175ad318826099f707d035c16978a910ad.jpg">

It is a squash blossom style, generic term for almost every beaded Navajo necklace. The sandcast pieces resemble more of a corn stalk, imagine that is where that comes from. The beads are machine made, so would make the piece most likely 1970s or 80s.