Something fishy here ? I think rifle has been refinished. The comb isn't usually as shallowly swept back as seen here. I wonder if this is sanded that way. The receiver was usually colour cased unless specifically ordered in blue. The front sight isn't original and I've seen Marbles rear sights look like the one on your rifle. The serial number under the lever is likely two digits or more depleted. I'd like to see a photo of the numbers under the lever. The calibre is usually stamped on top of the barrel just ahead of the receiver. I'd like a picture of that too. Interestingly the rounded lever was used in the early 1930's.