scjordan, the information I provided you in my original post was taken from Graham Greener's book, "The Greener Story."
Page 199 contains the serial numbers that gives the date of your gun being manufactured in 1910. Thru the years Greener used various grading systems. Found on page 195 is the 4th system for guns manufactured from 1902 to 1965. The highest of these grades goes all the way to 150, these are presentation guns and are truly beautiful.
Best guns are graded from 150 down to a G60.
Medium grade guns are listed for an FH70 all the way down to an F20. FH25's are listed as you can imagine, just above the F20.
Inexpensive models start at the A16 or F16.
For further information you can try contacting Graham Greener thru his website:
www.wwgreener.comGraham is a great guy and I am sure that once he can get to it he wwould try to answer any questions you might have.
Greener's is still making guns but only "Best" guns and just a handful each year.
LeFusil, I am curious as to where you are getting the information you are posting. Please share if you would.