Thank you for your thoughts - I will continue to collect advice. I won't be unhappy if the sticker is damaged or destroyed in removal,  but I owe it to the typewriter to make an honest effort to preserve this part of its history.

Kat - that Hermes 3000's sticker is such an eyesore.

I decided to go ahead and try my luck with my Olympia's sticker.  I used a hair dryer to warm and loosen the adhesive. I very slowly peeled up the sticker with just my fingernails as I warmed it with the hair dryer. The foil sticker came up slowly, but completely intact.  I cleaned up the adhesive residue with Goo Gone.  I plan to laminate the dealer sticker and attach it with a ribbon to the typewriter.

The paint under the sticker wasn't faded at all. It looks like the sticker had never been there:


 

Oh yes, much better !  Those circa 1967 SG3's had a properly enamelled finish - much better than paint !  Maybe the best place for the sticker would be on the back of the machine, above the manufacturer's plate.  This is where I would hope any self-respecting dealer would have put it in the first place !

I was lucky that I only had adhesive to deal with and not a screwed-on dealer plate. I was also lucky that the Olympia has the rock-hard enamelled finish that thetypewriterman mentioned.  I would have been a lot more nervous with an old, frail, painted surface.

I ended up laminating the dealer sticker that I removed since it came off in one piece.  I made a little tag of it that I will keep with the Olympia.

I've really fallen for this SG3 with its curves and little aqua accents - I guess this means I can join the SG Owners Club