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Most fun Gnutti item is not one of their products but rather their promotional truck...
View attachment 745183
here is a link to a pdf of their product catalogue for 1953 , right close to the time of your bicycle -
http://veterancycleclublibrary.org.uk/ncl/pics/Gnutti catalogue 1953 (V-CC Library).pdf
wrt drive train -
you could try laying a drive chain from another derailleur geared bike on the chainwheel teeth. if the teeth are for 1/8", which it looks like they may be, the chain will not be able to sit down on the teeth. your drive chain is a brand called ACHO which I have not encountered previously.
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