I asked below, and received the helpful information about ads that appeared in the magazine a few years ago.  

I followed up and that supplier is still in business:

L Bar S Ranch, Larry Scott
8490 North US Hwy. 285
Center, CO 81125
719-754-2508
(apparently no website)

He sent me pictures.  These look good.  I asked about one for the 77, he sent pictures by postal mail; these have the 3-color shield and &quot;Finest in Farm Machinery&quot;.  They have the pole that loops around the side and above the top.

Also, I found on the web  <!-- m --><a class="postlink" href="http://www.tractorumbrellas.com/ol4b">http://www.tractorumbrellas.com/ol4b</a><!-- m -->

These have a 2-color version of the shield and no text.

I don't know whether either source has designs other than fleetline.

I have not purchased, nor seen either of these types in person.  

Tom