[Boatanchors] transistor help needed

[WØQFC]

My transistor manual shows the base diagram of a 2N224 as having a small tab near the emitter lead; clockwise the base is next and then the collector.

The (really) OLD 2N224's I have do not have a tab, only a small red line on the side and I think this red line is marking the collector, but that is where I am not sure.

Was (is) there a conventional marking system for these old transistors? 

Any help/ideas will be greatly appreciated!

TIA es 73
Gene, WØQFC
Spring Hill FL