It looks to be the U.S. import verion of a Model 8 with upper hinged scears and without lower intercepting. It has one of the "Crown" marks as found on longarms and is for either workmanship or shooting performance. On the shooting performance more time and effort as put into the longarm in patterning and the like. Any chance of a better pic of the flats and the stamps on the underside of the left tube, or maybe you could just post the info?

Kind Regards,

Raimey
rse