The crown over R, I think is a British reproof mark although there is a very similar mark for Germany post 1891 according to Wirnsberger's directory of proof marks. The star over BB I can't find listed. The german crown is slightly different from the one illustrated.
Modern .38 handgun cartridges are .357 so I would strongly suggest finding out the chamber length or cylinder length plus base diameter (from the cylinder) and comparing with numbers from Cartridges of the World.
Remember even if the gun is made before 1898, if it is chambered for one of the various named .38 cal cartridges, it becomes a modern gun in the eyes of Canada. Further if modern, the gun would probably require a US export license which requires many months to obtain.
How about posting a photo of the gun so we can see what it is.
cheers mooncoon