CS Osborne Round Knife Stamp dating : eBay Guides

The Symbol and Trademark of the CS Osborne Company. I would like to have a series of blade marking in chronological order, then from that series get some dates that could be associated to the marks. I invite anyone with knowledge of the knife marks to add to the list as my collection is not that extensive. My list is only based on the fonts and the handle ferrule combinations, I can change the order any time. All marks are viewed holding the handle towards the viewer.
Earliest - circa 1860's
CS Osborne & Co Half Round. Newark NJ straight Est'd 1826 in the middle and USA on the bottom

Circa 1880's
CS Osborne & Co Half Round. Newark NJ straight.  Est'd 1826 on the back in a frilled box

Circa 1890's
CS Osborne & Co Newark NJ Round large. Made in USA in the centre

Circa 1890's
CS Osborne & Co Newark NJ Round small. Est'd 1826 in the centre

Circa 1900's
CS Osborne & Co Newark NJ oval large. Made in USA in the centre


CS Osborne & Co straight across

The knifes came in small and regular sizes, handles were smaller with the smaller blades. ON the biggest knifes, the size of blade denoted by "X" is 6". "XX" is 6 & 1/2". "XXX" is 7". the star used with the round stamp may have denoted be blade quality.