Age and value of this Griswold griddle

I have a #10 Griswold erie 740A griddle the Griswold logo is slanted and the circle cross is nearly invisible. Very nice condition though, I would like help with finding out it's age and approximate value. Thanks for the help.
Gary

Similar examples are seen in the red book, but none exactly the same. In addition to the ghost of the cross and circles part of the TM, also note the ghosts of crossing reinforcement bars. Changing to reinforcement rings doesn't seem all that odd, but erasing parts of the TM sure does. A similarly modified bail handle griddle pattern is shown in the red book dated ca. 1915. Older pieces with the crossbars and slant logos are dated 1909-1910. In any case, judging by values for #10 handled griddles in the RB and BB, I'd say $50-75 if, as the books say, "in excellent condition".

Thanks Doug for the help, I have bought and sold several Griswold pieces but am by no means an expert, I just had not seen anything like this one.
Thanks again.