A friend’s father passed and left her mother with various long arms.  I was asked to assist them in identification and selling them.  One is the Model 1906 pictured in this post.  I’m not knowledgeable about the Model 06 so figured I’d post some pics and ask for your thoughts. 

It has a standard 20″ barrel but has 2 different serial numbers…257096 B on the frame’s underside and 157774 on the lower tang.  I’d think the 257096 is the official SN as it is on the frame but please correct me otherwise. 

I think both front and rear sights are replacements…the front is a Marbles 37 W, which according to Stroebel’s book, was made for a Stevens or J.C. Higgins gun.  The rear just doesn’t look right and appears more like a modern replacement to me.

Thanks in advance for anything you care to add…Greg