Ok, I've seen the model G in white, turqoise, and brown, but never in this shade of blue:
http://cgi.ebay.com/ANTIQUE-VINTAGE-ELECTROLUX-CANISTER-VACUUM-MODEL-G_W0QQitemZ160357192491QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item255608932b&_trksid=p3286.c0.m14
Was this one of the colors used...