I visited a friend and fellow Remington collector last week. He has a very nice early 10 gauge Remington Whitmore Hammer lifter. It is obvious that this gun is above a grade 3 but we have not been able to source information as per how the grading worked in those early years at Remington.
I have some pretty good pictures but can't get them on this forum, I could e-mail to you.
Mike

Our Friend, Dr. Bill McPhail, once owned a #7 (Grade/Quality?) Remington Whitmore where I handled same several years ago at the Southern Side x Side; it was a fabulous gun and certainly the only example of that grade I've ever seen. Perhaps Bill will see this thread and add some information as he is very knowledgeable regarding the Whitmore grades.

The highest Whitmore I have seen is a 7. Very few 6 or 7 Grades.
Grade 3 is a very fine gun but condition is 90% of the value

Bill McPhail

Mike send me the pictures and I will post them.

Here you go.

Semmer called guns with that engraving the Grade 3 or the $75 Grade, but they had Laminated steel barrels while the gun pictured had Damascus which would make it a Grade 4.