My old mentor Blackie Owen used to torment the hell out of me with shards. He told me I wasn't a digger or a whiskey collector unless I could identify broken bottles while doing "field work". I had to pass the whiskey piece test numerous times just to get into his bottle room and peek at the master's collection. This broken one came out of the foothills above Nevada City.
That didn't take too long to get a positive ID. I guess I will have to make it more of a challenge on the next one.