Arco lamp  

I came across an Arco lamp for sale at a thrift store.
It seems like the real deal, however there's no mark or sticker anywhere. Copies I've seen before usually have either a round steel arch or a fortification at the point where the steel starts to bend. This example has none of those features. Have these lamps ever been copied to match the original exactly? Other things I should be on the look-out for? No pics yet as store was closed, made an appointment for tomorrow. Any help very much welcome! Thx