Markings on trade musket?

[tree]

Need help understanding pictured proof marks on a trade musket flintlock. Shows crown/BP 15 crown/BV. I presume that the 15 is the bore gauge. Would this be Belgium?

 

[dave_person]

Hi,
A picture would be nice. I believe they are Birmingham proof marks from the 20th century.

dave

 

[tree]

A picture is allways best but have not been able to post to this site. Have a good one sitting in my iPad.

 

[Wes/Tex]

The crown with block letters BP and BV are the Birmingham nitro powder proofs for 1904-1925...another variation of the same ran from 1925 to 1954. That's way late for a true trade gun with the possible exception of African trade prior to WWI.