Is there any other writing on the gun? Columbia was a trade name manufactured by the W.H.Davenport Co of Norwich, Ct, but I am not sure if they ever made a .410. There is little collector interest in single-shots and 2 1/2" shells are not available, so it will have little value. Since it was your grandfather's it should be priceless to you, but it would probably sell for $50-$75 today.
$50 - $120
0-75 USD depending on conditon.
*(Gun Appraiser)* they are worth about $250 to $400 thats for the 12 gauge single shot columbia. if there in poor rusty none shooting condition there worth about $50 to $80
What is a single shot pump?
Value of 75 Cherokee 12 gage single shot
what the value of a will davenport single shot shotgun 1885 in good conditcion
@ 50 USD.
it will do alot
25-100 USD or so
Impossible to answer without knowing if it is a rifle or shotgun.
Seldom exceeds 100 USD
what is a remington 20ga shotgun patented 1891,1903,1904 worth?