C23c - Creases On Back

I have this Plate Block of C23c. I've never seen the back look like this. Is this an artifact of the printing or the way it has been stored?

Looks like some Baaaaaaad storage, with adhesion to other items. One of the previous owners was not a good steward.

Edit: spelling

It appears to have gum skips and gum creases plus some kind of staining.

Help me out. Is the "staining"...the red bar across the top on the back?

No, the dark areas along the top row of stamps. It does not look like offset, more like something got slightly stuck to the block.

Tough for me to see it. It is lying on a black piece of paper.

Tough for me to see it. It is lying on a black piece of paper.

I thought you own this block? Why is it tough to see?


Peter

Why do you think this is a Scott C23c? I can't tell the true shade from a scan, but your red plate number precedes the known plates used to print Scott C23c. The earliest red number illustrated in the August 2021 issue of the US Specialist (whole number 1098) is 21911 and yours is 21854. You should get in contact with the authors Greg M. Ajamian and Robert Rufe (email addresses removed as per rules, sorry. Please use message system to request contact info or contact Don) as they will be interested in your plate block if it is a Scott C23c.

serf_tide

I have a similar block. Looking at the reverse of mine I notice ink from another sheet. I'm not seeing the same type of pattern on your stamps. Creases galore on my stamps though.

It is always interesting to see the gum gaps on the selvege margins of wet printed stamps since the gum was applied after printing and before perforating.

On the ink on the back...is this from another sheet? I thought that it was ink bleeding through from the front. I'm a definitely a novice on analyzing stamp conditions. I'll take the criticism.

serf_tide

The sheets are stacked on top of one another after printing. Sometimes the ink from one will transfer to the reverse of the sheet placed on top of it. Very common with stamps printed via the flat plate method. https://goscf.com/t/60604

Gum creases and not that uncommon on flat plate printed stamps.