It's the modern 703 you have there, so it is not really correct for an old 1680! But you can find some gens with the 703 new style coronet.
This would be the good one:
And the "over the top" for a 1680 would be this twinlock 702 crown (this was my crown, I've sold it on ebay for around 300,-€ , now I know it was a mistake!), they are going up to 500,-€ in NOS condition:
EDIT: HERE is only the crown without tube on the bay for sale...