Is there any way to determine the presence of a grill on a stamp (in this case, a #114 I think...or #125...or #114a) that is still on piece? please check my photos. One of the stamp. I've examined under microscope and stuck my light inside the envelope and illuminated the stamp from the back, and can't find any sign of a grill. The other two pictures are: one of the envelope, with notations made by the receiver with a date that I am convinced says 1870; and one of the letter salutation with date, that I am also convinced says 1870.
If it is indeed from 1870, and there's no grill, wouldn't it be a #114a?
But, if it's from post-1875 it (could) be a #125 although I seriously doubt it. I doubt it's even a 114a, but that's why I am posting here. Any sharper eyes or tips and tricks to discover a grill? Do I need to remove the stamp from the cover? I can, the cover holds no significance for me, if that's what I have to do.