What secondary bevel????
I mean you could create one if you wanted to by taping the spine 1 layer of electrical tape for the final finish..., some of the guys do a secondary bevel but most don't...
BTW the "Average" bevel to spine angle is 16 degrees we did a ton of measuring on razors to find that...
The outside angles range from about 12 to 22 but most fall within 15-17
Edit: somehow I think you might be talking about a Bellied hollow in referring to a second bevel...
Here are some pics of different razor grinds
The straight razor - Straight Razor Place Wiki