There are 3 different calibers that could be marked on the barrel ahead of the receiver,32-20Win.(32WCF),38-40Win.(38WCF),and 44-40 Win.(44WCF).
about 2 pounds
Mainly the wood and finish
What you might have is a angle eject, compared to the regular straight up and out eject.
One is a rifle round, the other is a pistol round.