1c Franklin 1850-S Guide Dot Question

Anyone know why some positions on the 1c Franklin 1850s plates 1E, 1L have two guide dots instead of one (others may as well, those are just the two I'm looking at right now. For that matter, the bottom row of the 10c stamp from the same era also has double guide dots)??? I can't for the life of me think of an intentional reason to have 2 dots and Neinken doesn't know why either.

Would be nice to see a picture!
I can think of one very simple reason, one I have ran into several times with the Transportation Coils: wrong position. If the engraver found the first dot to be in the wrong position he would just add a second one and not go through the trouble of buffing out the first one. I have several examples with double guide dots (LOM's) and double guide lines!

Peter

I think the reason for the double dots on Plate 1E/L is that there were multiple attempts with multiple relief rollers to make the plate. That is the short answer. Plate 1 of the 10c stamp is different but I can't offer an explanation.

I agree with Sinclair. It is evidence of how much trouble they went to when making the plate, and whether they essentially, got it right the first time, or not.

To expand a bit, specifically on the 10c Plate 1 ... I've always thought that this plate was entered bottom-up. I can't remember if Neinken figured that out or not. He probably did.

So for the 1c stamp, transfer roll #1 you see T-A-B starting from the top row. You see the double guide dots above top row stamps, where settings were made. Frequently, one sees a double transfer, or other issue with 10R on a plate. Namely, a double transfer. Think 10R3, 10R4. This was typically the first position entered, and they often had issues getting it right on the first position entered.

For the 10c plate 1, you see C-A-B, but starting from the bottom row. 100R1 is a double transfer, and would have been the first position entered. That agrees symmetrically with the 10R issues with the 1c stamps. Wherever they start, they usually have problems.

Thanks all!