Kevin,

That is certainly a nice BBF you have there. My first guess as to the date of manufacture would be mid to late twenties but the high relief vine work (love it) immediately around the top and sides of the breech as well as the underside of the receiver has me thinking it could be earlier. The guns that I have with fluted grip caps are earlier pieces but that could be coincidence. A few more pictures per Andreas's suggestion may help to dial things in a little better for you. Nice, very nice!

Regards,

Marcus