What you the value of Remington UMC 380 serial Number PA53638?

Answer 1

The value depends on condition, condition, condition, and condition.

The original box and papers etc also add to value.

Without knowing condition it is a $200 parts gun. It sounds as if you have a Remington model 51 semi-auto pistol which was made from 1918-1926. Without a detailed description of your pistol's overall condition, the value will range between 200-500 dollars depending on the overall condition. There were only 65,000 made by Remington during this time span.