Sense I have owned antique shops and second hand stores for the past 40 years I can tell you that 20 or 30 years ago duplicators were a hot item and could fetch $300 with keys. All the new type machines have replaced the old one. Now they have machines where you insert your key and it makes it for you and no staff is involved.
The market has gone way south on Key machines. I come across them all the time for $50 out here in California. Buying key blanks if you don't have what you need will cost more than having one made. They are so cheap at Wall-Mart.
With all the new fancy keys that have memory built in the old ones will not fit the new styles. The last home I built I put in electronic locks which had built in sensors.
The best thing is to put it on E bay for 99 cent start and let it fall where it may. The market on them has gone as far as I can tell. E bay is the best place to see what they are selling for. It is not something you will get more for on the open market.
I disagree.
When I was searching for key machines, I could not find functional ones anywhere. Instead, I was stuck going to Lowes 5xs a week making dozens of copies of house keys, that most of the time did not work.
Craigslist is where you are going to sell this. Maybe quick, maybe not....but that is where you will get the most money.
There are PLENTY of people in the foreclosure repossession business, realtors, landlords, etc that NEED to make new keys on a consistent basis. They can buy this from you & it will pay for itself in no time at all.
Key blanks are less than $0.25/each. Cut keys @ the store are $2+ & you have to take your time & gas to get there and back!
I would rekey dozens of locks per week with different keycodes, and I could use keys that I had cut & could verify them in my shop as working duplicates prior to ever walking out the door.
"Putting it on ebay & hoping for the best" makes about as much sense as a farmer throwing seeds out the back of his house & hoping by some miracle he has a big harvest in the fall.