I am removing and replacing the BB on my Centurion Dave Scott Ironman. Removing the crank arms and the right side of the BB was fairly straight forward but now I have hit a wall. The left side uses a 32mm wrench but it seems to be stuck tight. Before I really start wrenching on this thing I want consult with you all and get some ideas on what I should be doing. Is it reverse threaded?

The BB has a name on it but the name has been scratched off. It still has "Made in Japan" on it and says "1.75 x 24". What does this translate to in terms of what size BB I should buy?