I'm going to suggest 1920s. Sweeping statement - but the couple do not look to be of "English" heritage.
If you have the original photograph is there anything on the back, or embossed on the front, giving name of photographer or studio?
Unless you know who the couple are, and when and where they married, I don't think you will be able to narrow down location with a studio portrait like this.
And is that a wedding ring on his right hand? A European tradition?