B66-274 LEVEL. Barnes Patent. Patented by Edwin Barnes of Boston in 1875 and features mirrors mounted next to the plumb and level vials to make them easier to read from different angles. For some reason, the few known examples are marked "Pat. Sept. 26, 1874", which wasn't a Tuesday and also doesn't appear to be a Canadian patent date. 30" long and made of lignum vitae. The brass has been polished, and there are some splits in the stock. A very rare level in nice clean condition. Good+ 400-800