In my opinion these thermometers are very under appreciated in the hobby. Your Thermo has a paper face and brass case. Some of them had convex glass cover. Some had a flat glass. Very few survived in good condition, as you could imagine that if this thermometer was left outdoors for 1 rainy day, the paper face would of certainly get wet. If sunlight shined down on it for a couple months it faded out. I'm not a wolfs head expert, but would date your Thermo pre 1920. THe bad news is that if you decided to sell you may get lucky and find a wolfs head collector who would pay more for it due to shock value, unfortunately a chipped up porcelain prestone would probally bring more money. I doubt this would fetch more than $150 on eBay, I would like to be wrong! This is the second wolfs head I have ever seen. Thanks for sharing!
