Yours is the first model variation with a push button latch.

Can you post photographs of the entire revolver? But, from what I can see, there are serious nicks in the recoil shield. As many of these remain pristine from spending over a century in a nightstand drawer, this significantly compromises yours and it might very well be that $200 is too much to pay, even if an antique.

We need more photographs to better judge this.