Hi Ilio:
The Centennial revolvers - especially the ones like yours with the grip safety, were also known as "Lemon Squeezers", and many people still refer to them by that name. Yours looks like an excellent specimen that is in good condition. Being an Air Weight, it is susceptible to frame cracking. Please look at the part of the frame below the barrel (where the side of your thumb is in photo #3). Check this area carefully in good light for a sign of a crack running parallel with the barrel. If no crack, you should be good to go. In a revolver of this type and vintage, I would stick with standard velocity .38 Special ammunition. You could probably get away with occasional use of +P (higher pressure ammo), but I wouldn't risk it.
Good luck,
Dave
PS - I just took another look at your photo #3 and it looks like there may be a bit of rust forming there in the yoke area - maybe even a bit on the ejector rod and ejector rod retention pin as well. You may want to give this a closer look. If it is rust, no big deal, but it's worth trying to knock the price down a bit - maybe see if the seller would go for $400.00, rather than $480.00?
Regards,
Dave