134's With Grills (Grill Check And Value Question)

Photo (Scanned at 1200 dpi) attached is of a cover of mine that has six #134's, five of which I clearly see grills on, plus a 136 also with grill. I need another set of eyes to look at the third from the left 134 and tell me if you see a grill there (the stamp with the really dark almost SON cancel).
Second question: my Scotts (2004) lists 134 w/grill on cover at $185. What's the current value, and how would you value multiples like this?
EDIT: third question: is this something that should be authenticated / certified?

And oh, yeah, of course, if these AREN'T 134's please tell me and give me an idea of where I went wrong.
Thanks in advance for all your help!
dave

Hi, Dave. Unless you provide a very close-up high-res photo I don't think anyone can answer the question. A cancel can reveal a grill when the stamp is viewed from the front, but sometimes they can only be seen from the rear.

Got it. Let me see if I can make my scanner do some magic.

Oblique lighting works best for illuminating grills, shine a bright light across the stamp. The light will cast shadows from the raised grill points, increasing their visibility.
Nice strip group of 134s. I would think it would be even more interesting if the stamp in question does not show a grill. Two different 1c Nationals with 136.

Phil and Dudley, thanks (thanks also Phil on the 114 question). So what I did is I cropped and scanned each stamp individually at 2400 dpi. To me they all look the same (and the scans don't show the grills the way they pop when you use oblique lighting) but I'm hoping somebody out there knows some tricks to maybe make the grills show up better in scans? (contrast? brightness? I have no idea). And I'm most curious if they lose resolution when they are "optimized." The stamp I am most interested in I will post first. It's the one I can not see any sign of a grill on. The rest of the photos will be it's cover mates.
Thanks in advance for any advice and opinion!
Dave

I can't really see grill points on most of the 134s, and what I can see looks like H grills, which are often weak, or partially impressed. I do see an ink smear on the lower left of the 2nd stamp from the left. Also check for split grills. It is possible the New Orleans post office added 5 134s and a 145 to the 136 to make the triple weight rate to Texas. I believe the "Via Galveston" indicates it was sent across Gulf of Mexico rather than by land.