Welcome to the board!
You have a machine that was very likely made in Japan in the late 50s or early 60s, guessing from the styling. The underlying engineering is from a Singer Model 15, although if you look that up this machine won't look like a Singer 15.
It is a nice looking machine, and, assuming nothing major is wrong with it, it can be cleaned and oiled and will sew nicely.
What's it worth? Probably not as much as you'd hope. Here are two links about "what's my machine worth":
This one is informative but won't give you specifics:
http://ismacs.net/sewing_machine_art...ine_worth.html
this one can sound a little demeaning, but I happen to agree with him:
http://www.doubleveil.net/zssmp/worth.htm
I just sold a Japanese made Singer 15 clone, that was in very good condition, for $40. The buyer was motivated and turned around and spent another $25 for a better motor than the barely working Singer motor I had on it. It did not have a table, but did have a table top case/base.
If you decide to sell it I would use craigslist or facebook marketplace ( I am not on facebook and do not use marketplace). You will not want to ship it, so you skip ebay and focus locally.
What's it worth, in my opinion? Based on machines I've bought and sold, and what I see languishing on local listings: less than $50, but you could start there or higher or lower.