Set of 4 Chairs - maker Stewartstown - any information helpful

I have been given a set of four chairs. I think they may be mid-century from the Stewartstown furniture company. They have a veneer -- which is in ok condition. 

I was going to refinish/paint them but don't want to ruin value if they are worth something. 

I can't find any information on them or possible value. Any information will be very appreciated.

Thank you.

Lisa