Shipping antique firearm to foreign buyer
 

Is there anything in US law that restricts shipping an antique firearm from the US to an overseas buyer? The gun is a definite antique from the mid 1800s. I suppose it would be shootable if anyone could find the correct components and really wanted to try, but generally I view it as a nonshootable antique. I am familiar with the standard response that BATF does not regulate firearms made prior to 1899, but other federal agencies may be involved in regulating exports.