Good morning.
I have some Heuer Montreal, and this crown question was in my mind several times.
If you see pics of Heuer Montreal vintage you can see that there are different configuration.
I remember in one advertising Heuer from '70 there was a blu Montreal with a crown without Heuer logo, but production of this watch chose to use crowns with logo.
I have also seen various Montreal live, which I consider correct and original, with crowns of two measures.
So I don't do many problems... both of these size can be considered good.
-imho-