Hi Sally, and Welcome to the PGCA Forum.
Your Grandfather's gun appears to be in remarkably nice condition, and it's hard to believe he took it out much.
Apart from a regular wipedown with a good silicone gun cloth, and stored in a humidity free environment, you really don't have much to be worried about.
Contrary to what you may have been led to believe, these guns, and quality Damascus barrels in general, are perfectly safe with modern, smokeless loads in the light loadings, usually under 1200 fps (ft per second.) You'll find dozens of members here who almost exclusively shoot damascus hammer, and hammerless doubles. Look into ammunition loaded by RST. I shoot a dozen or so cases per year of Lite, and Maxi-Lite, in all gauges.
On first blush, your gun appears to have it's case hardening colors refreshed at some time in it's life, as they do not appear like most guns I see. The wood looks quite original, which might lend credence to the case colors also being original.
For insurance purposes, I might suggest you value your gun in the range around $5000.00
Once again, welcome, and drop by anytime.
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