Never heard of a PB 38
Impossible to answer without a detailed description.
50-500 depending on specifics
You are probably referring to a 7.65 Parabellum cartridge. See the Wikipedia link below.
If you need an answer please state the current condition of the pistol. Is it in Poor, Fair, Good, Very Good or Excellent condition?
The "PB" on a Beretta pistol typically stands for "Pietro Beretta," the founder of the company, indicating that the firearm is a product of Beretta's manufacturing. It is often found on the frame or slide of the pistol and signifies the model's authenticity and quality associated with the Beretta brand. Additionally, the "PB" may also refer to specific model variations or features unique to particular Beretta pistols.
I have a P. BERETTA-CAL. 7.65-BREVET-SARDONE V.T. with a 1947 datestamp just to the right of the left grip, which has a stylized PB on the lower part of the left & right grip. The serial number is 661415. Two weeks ago a gun dealer in Florida said the gun is probably worth about $475 because it is in great condition and probably a collector's item.
Impossible to render an evaluation guess without a detailed description
Cellery and PB PB & Jelly Chocolate and PB
In the Penetrant PB B'laster, the PB stands for Penetrating B'laster.
Pb , derived from Plumbum.
Pb is a compound.
Lead or Pb ALWAYS has 82 protons.