The market for domestic labor saving devices such as this are quite modest in the current market, and they really only appeal to very specific group of collectors. Most gas irons are not rare, being produced in great numbers up until World War Two. While some of the more unusual or early examples can sell for over $400.00, most like your Montgomery - Ward today sell for less than $100.00.
Lovejoy
Re: Mntgomery Wards Quick Lighting Gasoline Iron #4045