I took your last example of a cover and rotated it and re-posted it here:


It's fairly easy to do.
By the way, this example is one of the most colorful period advertising covers I think I've ever seen! It's also interesting that they did the colorful printing on the face of the envelope and left the side with the flap for the postage stamp and return address and address of the recipient. Although stamp collectors didn't appreciate it, from an advertising perspective it was probably a great idea, as after the communication was opened and processed, you still had a full undamaged advertising front of the envelope that promoted their products. I suppose from an advertising perspective it was quite clever back in the day.
Here's a history of the company:
Quote:
The success and progress which follows enterprise and merit is ably presented in the business career of the Western Star Mill Company, one of Salina's most improtant industrial institutions. This mill, located on North Fourth street, is well appointed, with the latest in equipment for the manufacturing of high grade hard wheat flour. It became established in 1868 and is one of the most successfully conducted flouring mills in this section of the country. The magnitude of the plant and its high class appointments can better be understood when it is stated that 1200 barrels of flour can be manufactured daily and the elevators have a storage capacity of 300,000 bushels of grain. The plant covers one-half of a block and gives employments to thirty-five assistants under the supervision of an expert miller. A specialty is made of the "White Elephant" brand and the "Pride of Salina," both hard wheat flour. This company became incorporated in 1901, with the following officers: H. H. F. Sudendorf, President; James Haskit, Vice-President; H. E. Brooks, Sales Manager; George T. Wooley, Secretary; E. H. Sudendorf, Treasurer.