After casting, its inner surfaces were smoothed down, unlike todays.
Some say there was a better formula for the iron produced in that time, and that this formula has since been lost. It's not light, but I do think antique cast iron is far more elegant than its contemporary counterpart.
After running this site for several years, many similar questions arise, useful links and general information have been posted on the FORUM.
In 1903 the company moved to new premises at 12th and Raspberry Streets.
However, since it was registered with the US Patent Office in 1909 as an actual trademark, it would seem that the term "trademark" or "TM" would be preferable to "logo" More info on the Griswold TM at THIS LINK .
Here's a pix of the small TM, block TM, slant TM and heat rings..
Some gave the expected "OH MY GOD YOU'LL RUIN EVERYTHING!
" And some people I know and respect pointed out, incredulously, my use of current era Lodge cast iron.