Here I have a John Lennon serigraph titled "Whatever Gets You Through The Night" I purchased on Ebay a few months back.
It is reportedly signed by Ono, contains Lennon's embossed reproduction signature, chop mark, and a couple other embossed symbols in the lower right hand corner.
Included is a COA from Bag One Arts with a watermark and embossed logo.
I am curious if the serigraph is in fact signed by Yoko Ono in the bottom left corner.
I wrote "Cranes Best" - it is "Cranes Crest". I responded to your message. I have run into this name twice, always on superior items - but that does translate to authenticy on its own.