Technical Is this a Model B distributor?

I'm trying to ID this distributor. Any help appreciated.

 

No that's an A dizzy. The mid 28 to late 30 version. The late ones have the ears bridged over the clip

 

Looks like the one on my A.

 

Thanks much!

 

I think the "B" has flyweight advance, model "A" has that lever to pull the points plate to advance/retard timing