What was it used for?

[phillie]

This tool was probably hand made by some blacksmith to do a certain task. What task I do not know. It measures 16" long and both arms move. Thanks for your help.

[keykeeper]

Looks like double caliper to me. One large, one small. Nicely made, I might ad.

[phillie]

Thanks...that would make sense...I got it out of an old machinist box.

[Branson]

Yep, double caliper.