Amber Wheat Glass

These are a mystery. They do not match any wheat pattern I have found and there are no manufacturing marks. It is a 16 ounce size and rather heavy for this style glass. The word "Triguba" is on the side in one place. I looked it up thinking it might be a variety of wheat, but have not been able to find any helpful information. There are no chips, cracks or breaks. The enameling shows very little wear. There are 2 available and priced individually. I need your zip code to calculate the postage.