It measures about 18 x 14. There does appear to be a greenish spot near the top.
I did not try to remove it. I have another mold identical to this one for sale. The item "Antique chocolate mold Santa sleigh tree & toys with reindeer Eppelsheimer & Co" is in sale since Monday, February 08, 2016. This item is in the category "Home & Garden\Kitchen, Dining & Bar\Cake, Candy & Pastry Tools\Candy & Chocolate Molds".The seller is "easymoneyauctionsks" and is located in Hutchinson, Kansas. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, to China, SE, KR, ID, to Taiwan, TH, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to Mexico, to New Zealand, SG, to Switzerland, NO, SA, UA, AE, QA, KW, BH, HR, MY, CL, CO, CR, PA, TT, GT, HN, JM.