Help Detecting Grill (Or Lack Thereof) On Classic US Stamps

Is there a method of detecting if a grill has been flattened so the stamp appears as non-grilled? I have a potential Scott 125 that I cannot see a grill on. Used watermark solution (per a suggestion) and magnifying glass and no sign of grill. Any suggestions would be appreciated. Not really in a position to submit for expertizing and pay an exorbitant fee to find out it is a manipulated 114. Thanks.

Can you scan the reverse side and post the scan?

Where a security feature is absent on a different issue that is much rarer, the question becomes is the absence of that feature just a lack of visibility - maybe due to tampering - or was it never there? That is the relevant question.

1869 grills were often light, and could get pressed out from use, or from being in an album for 150 years. The first thing to do is dip the stamp; instead of looking for a watermark, look for the grill. It will usually show up fairly easily.

I did "dip" it in watermark solution and no grill showed up. I saw there might be some enhancing I could do to photos to detect it, but I am not very savvy in that area and wouldn't even know what photo software has those kind of capabilities.

Here is backside.

You may have to take a photo at a slightly oblique angle. I'm not seeing it, and I don't know if it is possible to definitely tell the difference between no grill, and pressed-out grill.

It does not help that the 114 is listed as without grill, not to be confused with the no grill 125 reprint.

When dipping, the flash of a grill can be rather quick in the drying process if such was light and pressed out.

There is no chance at all of this stamp being a 125. Not with that impression.

From "Opinions III" published by the Philatelic Foundation, article by Stanley Piller, page 58:

Thanks for the UV tip. Based on that, it is a 114, but possibly one of the rare grill less ones. More than likely just a 114 with the grill pressed out. Thanks for the all the responses!!!