newoldcolnago

Please help. I am not sure exactly what I have got here, but I was told it was a late 80's or early 90's. I have done some research and come to the conclusion that it is a Masterpui? It has the internal rear brake cable routing on the top tube. It has the chrome lugs up front. I have not been able to find a serial number in all the "normal locations" the right chainstay is chromed. It is in the era of the adjustable rear dropouts. Unfortunately it did not come with the original front fork. Any help on this would be appreciated. Also head tube sized for a 1" steerer tube.