I just got a new mushroom. It has a skeletonized Sea-Gull ST-1901 (TY2901SK) movement. I purchased it through "alwaysatauction.com", which I'd never dealt with before but the price was excellent (under $100 USD) and it was shipped quickly (by FedEx no less) and arrived looking exactly as described. It seems to work fine so far, stop/start/reset is nice and smooth, winding is easy and it's running about 15 seconds per day fast. There are better pictures on their site, these were taken with my cellphone so the quality isn't great.