Er, OK, but it is not.
That is the link I gave in my reply - and as I said yours has ROM not RO and
also different shields, then the other reply from a member has the correct shields except
that the top two are on different sides - left is right, and right is left.
So it is neither, I think.
I made this, with shields swapped ...
also I made the lower shield with two smaller horizontal bars,
rather than one thick one.
So that is what it would look like to make it similar to yours.
If you do a search on acsearch for Deutscher orden 3 kreuzer 1680, you can find 9 examples of the 1680 3 kreuzer. 7 of these have spelling ROM reverse, so this is the common spelling for 1680, with RO being a less common variant.
However, on the obverse, all of them have the thick horizontal bar on the shield on the bottom, and none have the upper shields switched.
The reported weights vary between 1.5 and 1.6 g. for the three examples for which a weight was reported.
So, we should also consider that this could be a counterfeit, based especially on the low weight .
