Raimey, Thank you for your replies. To answer your question in your first post, All of the markings that are on the bottom of the barrel are visible on the two flats in that picture. Other than Collaths name and town on the top two flats either side of the rib there are no other marking on the barrel. I do have a better picture of the bottom oblique flat with the proof marks on it.

The Crown-crown/N proof that you see on the barrel and receiver ring are also on the top and bottom of the root of the bolt handle. Thank you for the info on the RS in the oval, it would be interesting to know what the E3B in script means. On your second post, other than the Crown-crown/N in the same place on the bottom of the receiver ring and the load proof on the side of the receiver I didn't see any markings that were like those on mine. Would love to see the rest of the rifle, looks very interesting. I did notice though that the bolt handle shape and checkering looked the same as mine.

Thanks again so much for your replies.