Which white saddle do you like?
 

I am building a '85 Trek 660 that I got as a frame set and it originally had a white saddle.
What does anyone like that looks like it belongs on that bike.

Is a San Marco Rolls too modern looking?

I think it's fine style-wise. Do you have something on the bike to pick up the gold accent though? If not, maybe fish about for a white Turbo.

San Marco Regal. Accept no substitutes.

Good point about the gold. There is none so the Regal might be the one.

white turbo's are not too hard to find