These are scans of the individual manual pages at Smithsonian:
http://www.sil.si.edu/DigitalCollect.../NMAHTEX/2678/
And these are similar scans of a booklet about using the attachments:
http://www.sil.si.edu/DigitalCollect.../NMAHTEX/2663/
I wish I could find a 28/128 with those decals - they're called "La Vincedora." I've had one with near-perfect "Rococco" decals and two with "Victorian" decals in poor condition. But, they're great little machines and sew beautifully, as well as being really pretty to look at.
You can often find antique/vintage attachment sets on eBay pretty cheap if you watch for them.