I appreciate the insight, yes I plan on hanging on to it for it’s sentimental value. Thank you!1955 Government Models in 45 ACP are in short supply. Your Super 38 even more so. Colt only shipped 2247 of them in 1955. Presuming the internals and barrel are original and because there are so few of them, I think the pistol is easily worth in the neighborhood of $2000-$2200. Some might say more.
Personally, I'd disassemble it, soak it in Kroil or Ballistol for a few days, wipe it down, put it back together and set it aside in a safe place. It's a gift from your Grandfather. Hang onto it.