It looks much more normal in this picture.
I looked to find a 20xxxxx or 210xxxx serial
to compare fonts but couldn't find one.
1.83m has a curved flag on the 1 in 1675
2.3m has a horizontal flag on the 1 in 1675
Your 2.1m is different.
I don't know if this is correct or not.
If you could find a 2.0 or 2.1 and compare
the 1 in 1675, and the height of the 1675 from
the base it might make you feel much more
comfortable with the case.