help me find this design classic floor lamp

Sorry but without a picture, it's unlikely forum members can help you. Why not go back to the place that sold it so you can and find out more about info. They might know about it if they sold it. Then you might look for it easier.

Here's a thought, why not do a search on the Internet (Ebay) for vintage Guzzini lighting and see what you come up with.

Apropos of nothing, on Ebay there's an attractive '60s or '70s Guzzini vintage lamp for sale. Hey, I like it...and it's not ridiculous that you might also. Moreover, there are quite a few vintage Guzzini floor lamps on Ebay.

Here's the link:
http://www.ebay.com/itm/rare-MOANA-desk-lamp-Massoni-Harvey-Luce-guzzini-60s-70s-italy-table-/252110068130?hash=item3ab2ee59a2

yes that one is also really nice! but not really the lamp I'm looking for unfortunately. Thank you though!

Did you look on Ebay as I mentioned? Here on Ebay is a link to a similar-looking vintage Guzzini floor lamp being sold:

http://www.ebay.com/itm/Vintage-Harvey-Guzzini-Mid-Century-Modern-Arc-Lamp-Laurel-Lighting-Mfg-Company-/221901502449?hash=item33aa5c37f1

... and here's another:
http://www.ebay.com/itm/Vintage-Harvey-Guzzini-Arc-Lamp-Marble-Base-Chrome-Plastic-Mid-Century-Modern-/171805871081?hash=item28006d8be9

Hey ,why not ask the seller of the vintage store,where did he find the lamp and whether it can be sold on another store or when it will be sold next time .Go back to the store and hope you'll find what you want .