Anyone know older maravia boats?? My guess is its from 90's sometime. Fabric is in great shape and doesn't leak at all. only damage is glue on maravia logo is loose and drop stich floor is kinda stained and dirty. Valves are military and all aluminium. I have looked and there is no id tag of any sort. So any buzzards have a clue. What is this boat made out of pvc or urathane doesn't have coating like newer one??? Is it welded or glued?? D rings look glued but not sure of body construction. Know any products to clean the floor?? Spray on boat cleaner n scrubbing had no effect. Any other info greatly appreciated.