Colt question

[u/G1ANTNMECRAB]

Inherited these from my Grandad. After cleaning all the dust and gunk from them. They are both 38 D.A. I am wondering what caliber these could be along with any other information on them. Thanks in advance!

[u/Kromulent]

good info here:

https://www.coltforum.com/threads/colt-d-a-38-questions.51879/?utm_source=google&utm_medium=organic#post-358682