I'm no expert but I'll give it a shot.
I guess you already know that vintage Invicta has not that much in common with modern Invicta.
This is, I believe, a Landeron 48 in a plated case. Generally, it is recommended to pursue solid metal cases, but if it does for you I see no problem. I'm guessing this was manufactured around the 1950s. You'll also have to be a little more careful with this as the movement has no shock protection.
A quick google yielded this:
https://www.watchuseek.com/threads/the-history-of-invicta-seeland-watches.519880/
Hope this helps.