I would just like to find out what I can on this machine serial #A452-31-1, it has gold writing on it. Please help if you can THANKS.

I have a Singer sewing machine # AE512374 has all parts wooden bobbins, original needle packets, instruction manual all in original cardboard box in side storage compartment of the machine. It is in very good condition and runs great. The only bad thing is the wooden cover box has a hole the size of a half dollar. Case even still has the key tied to the handle with a worn green ribbon.
Do you have any idea (Ballpark) what it might be worth?

I have a Singer Fashion mate 257 very good condition, I would like to get it repaired or sell it