AMT extended barrel for Ruger mkII

Hello!

I have a 12.5" AMT bull barrel with a drift only rear sight for the AMT lightning/Ruger mkII. It has been mounted on my mkII frame but never fired, and has just a few minor scratches from storage. I just wonder what the value might be. I saw one sell on gunbroker recently for $1288, but realize that the seller was the son of the founder of AMT, and that there may have been some value added by that history.

Any reply will be appreciated,
Hans