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I have read through many different sites for both Parzinger and Stiffel I found no documentation that he ever designed for Stiffel !! Although many of their lamps do say "attributed to" !! Your lamps look like typical late 70`s or 80`s style and not like the mid century lamps attributed to Parzinger !! Go to palumbo.com and send them an email or the Stiffel website !!
Excellent !! Where did you find that website ?? I have never seen it !!
If it were me,,I would do lamps only if selling online !! Then take an additional pic with the shades on to show how they would look !! You could however list the shades separately as a Buy it Now and state that in the description in case someone did want the shades too !! I have found that most of the time people want to pick out their own shades to go with their décor !!