Imper. Pairs 1597c & E

I purchased this vertical imperforate pair which was listed as 1597e from a dealer. I assume it is correct and have no reason to doubt it. What I would like to understand is how to tell the difference between a 1597c and 1597e. Scott describes them as below:

1597c - Vert. pair, imperf. btwn and natural straight edge at bottom
1597e - Imperf., vert. pair

I would like to add clarifying info to the Tagging and Luminescent DB on what the difference is. I assume they are referring to a stamp from the bottom row for 1597c. How does one tell if it is a natural straight edge versus one that someone cut very carefully?

1597c would be perfed at left and right.

1597e would be fully imperf all around.

john, to be imperforate between, the top as well as the sides would be perfed and either horizontally or vertically between the stamps would not be. this is the the reason the natural se at bottom is mentioned. the item shown is an imperforate vertical pair and is a 1697c. Scott's illustrates imperforate betweeen in the info pages. please see also the stampsmarter site.

What is a full sheet worth?

The sheet is worth precisely what someone will pay.

The 2012 Durland Standard Plate Number Catalog values the imperforate plate number block of six at $180.00. The remaining imperforate vertical pairs (1597e) are valued at $15.00 each in the 2019 Scott Specialized Catalogue of United States Stamps and Covers. If you were to cut the sheet up you would have an imperforate plate number block of six, twenty-one imperforate vertical pairs and one imperforate horizontal pair which may or may not be distinguishable from Scott No. 1618Cd, the imperforate coil pair of the same design with small block tagging (2019 catalog value of $20.00). To qualify as an imperf there cannot be the slightest trace of a perf wheel indentation in the paper.

He has it listed for $800
https://www.ebay.com/itm/U-S-1597e-...254202401399

Don