Ah! So interesting researching these old shotguns. JDW; I apologize. In my first post I inadvertantly listed my serial number as being in the 144xxx range.... In a later post I correctly listed it as being in the 178xxx range. This LC Smith shotgun, serial number: Fw 178048 is listed on the LCSCA website as being manufactured in 1939. The chart on this site claims it was made in 1938...... Confusing, but I am happy you replied to this thread. Your comments on the Single Sighting Plane prompted me to measure the rib. The height of my rib measures 1/4 inches above the barrels, at a point 12 inches ahead of the chamber end; near the middle bead. Due to your information, I'm thinking my gun has the optional high rib.
One other question, and I'll probably have more.....Both barrels are marked ahead of the flats: Armor Steel LLH. Do I have some kind of odd barrels made from Belgian blanks???
Thanks for all the good information...Grant.