Those are a sweet little firearm.  I've got a .22 over .410 under and it is just perfect for use around where I live in the country.  It's also one of my main canoe trip guns, I have a stock sock that holds 8 rounds of .410 and have both buck and #4 shot in that so it's handy for whatever comes along.
  The guns are difficult to find and you're lucky to have that one especially with the .22 mag on it.
  I refinished my stock and found a beautiful blonde curly maple wood underneath the factory stain.
  Needless to say, if you ever want to sell that one, please let me know...
Also, mine is a model 24 S-D, can one of you fellow gun enthusiasts tell me what model year that is? or what the S-D designation means.?