Actually "godzilla" is a slang term for the finish. Singer referred to it as "crinkle". The term godzilla started over a decade ago. I'm not certain, but I was under the impression it started from those collecting the 221's with this finish (which are scarce).
Billy makes a great point on the 3/4 cabinet, they are getting harder to find. I have a 15-87 with RAF decals that has a 3/4 cabinet. I love this machine ;-).