Books on parker ss shotgun.

[Richard Tucker]

I recently purchased two books on parker bros. s-s shotguns, They were by Ed Muderlak (Parker Guns "Old Reliable") and Peter H. Johnson Parker America's Finest Shotgun,Most of the information was on hammerless shot guns, Is there not much information on hammer guns on record,Myis a1887 12guafe double barrel with hammers. In buying books and going to different web sights I still have not been able to determined the grade , Here is what I know, On water table there ia a T with half cresent above and below, It has a small c at bottom of left lug going left to right and beloe about half way off to left side oc about halfway down is a 4. I need help Richard Tucker