VICTORLOUIS: The gun reminds me of a Ruger Security Six. The big difference between the Ruger and the Manurhin is the fire control. Each gun uses a coil main spring. The Ruger fire control is removed from the frame through the bottom of the frame, the Manurhin has a side plate to access and remove fire control group.
The grip and the trigger feel like a Ruger.
Ruger has a long history of suppling the French with firearms so Ruger must have been involved with manufacturing the model 88.
There is a step in the cylinder that restricts use to 38 special.
2 photos shows how far a 357 158 grain roundnose will fit.