Centerline Block Of US #852 - Odd Perfs?

This #852 block of four obviously comes from the sheet, the center guidelines can be seen. The left stamps have the extra wide margin of the center line, but what are those perfs on the left? Weren't the sheets of 400 cut apart into panes of 100?
Thank you in advance for any insight/education.
don

Printed into sheets of 200....divided into 4 panes x50 each

Oops my bad, sheet of 200. So when you say 'divided' do you mean cut or perfed in some way?
don

Don...the line you see to the left, vertical...is a pane divider line.
This sheet was perf shifted to the right causing the pane diver to be visible on the left.

Normally the guide line marked where the gutter was to be cut. The gutter margin was always much narrower than the outside margins on those panes of 50.

In this case I don't know about "perf shifted right" but the left pair of stamps is considerably wider than the right pair, leading me to think that the alignment of that column of perfs you asked about was set too wide. Those perfs should have been closer to the left side of the design. How they got off like that I do not know, but most of that white space in the gutter up to the line should have been margin after cutting in a properly set pane.

[deleted useless reference to "guttersnipe" which just confuses the issue. This is simply misperforated.]

I could not find the proper term for it, but these sheets have a "wavy" cut that separates them. (see ebay sheets for examples)

It looks like that cut was right at the edge of these perfs, which as noted above are further left than normal.

I'd say two things: 1, the left-side perfs were shifted left into the vertical guide line, and 2, the vertical cut of the press sheet sliced through those perfs. It would be easy to miss in post-production inspection and at point of sale.