Your 357 is cool.
Someone has installed an old model SBH wide trigger and wide hammer. That was a popular modification back then. Your grip frame needed the trigger slot widened.
Here's an old model 22 single six with SBH hammer, trigger and grip frame I did for a buddy with large hands years ago.
Here's my Old Model 357, SBH hammer, SBH wide trigger, and Ruger Old Army XR3-RED size stainless grip frame that comes with the wide slot and bolts right on to old models with no adaptation needed:
Converted old models do not work like the new models with transfer bar. The action functions the same as before conversion:
1. There is no safety notch on hammer; that's why there's only two clicks.
2. Loading gate is not interlocked with the hammer.
3. Chambers still align with the loading trough on half cock.
4. These work the same as the new model Bearcats which use conversion kits and were not redesigned for the transfer bar like all other Ruger single actions. In fact a NM Bearcat can be converted back to an old model just by using old model action parts!