Would anyone care to comment on what stamp is shown here?

As far as I can tell the only choices are a 135, 146, 157 or 183. I tend to think it's a 183, but even at that I note there are two varieties referred to in Scott Specialized, as "vermillion" or "orange vermillion".
Based on the stamp color charts recently posted, it doesn't look like "vermillion" to me; on the other hand, the charts don't show an "orange vermillion" color chip.
Any ideas?