Some of you may remember I had a blue bird with this quilted effect inside, and I thought it might be Marcolin, but now I am not certain......the base was quite well polished, but not as well as my signed Marcolin and FM Konstglas pieces.
I have sold it now, but these are pictures I have of it, and I have seen others listed on eBay, very similar, that were sold as Cello.
I hope this helps a little.