You're quite welcome, Jim; glad you appreciated the ad posts—especially the Model K's! And let me say that once again your refurb work is outstanding—thank you for posting those photo's!
By the way, I plan to post a bunch of newspaper advertisements at some point, too; so there are bound to be some featuring the Model K.
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May 1910-Feb 1958 Eureka Upright Models For Reference:
Source - "Shipping Record of Eureka Vacuum Cleaners", published by Eureka-Williams Corporation in Mar. 1958, posted on VL thread 33551 by DadsVacuum from his father's work ephemera as a Hoover Company dealer
Straight-Air Suction
•May 1910-Dec 1911 – Model 1
•Jun 1912-May 1912: Model 2
•Jul 1912-Jan 1914: Model 3
•Jan 1914-Apr 1915: Model 4
•May 1915-Dec 1915: Model 5
•Jan 1916-Apr 1916: Model 6
•Sep 1916-Sep 1921: Model 7
•Mar 1921-Feb 1922: Model 8
•May 1922-Apr 1927: Model 9
•May 1927-Dec 1927: Model 10
•Jan 1928-Dec 1934: Model 11
•Feb 1929-Feb 1934: Model B (Special)
•Jan 1931-Jun 1934: Model D
•Apr 1931-Nov 1934: Model F (Standard #2)
•Jun 1934-Mar 1947: Model K
Revolving Brush-Type
•Oct 1932-Oct 1938: Model G (polished)
•Nov 1934-Mar 1942: Model D171
•Jul 1936-Jun 1939: Model M (polished)
•Jun 1937-Jun 1939: Model G2 (polished)
•Jul 1937-Jan 1940: Model R
•Jan 1940-Dec 1949: Model G30 (polished)
•Feb 1940-Dec 1940: Model K-60 (polished)
•Feb 1940-Dec 1940: Model M-60 (polished)
•Feb 1940-May 1941: Model R-40
•Dec 1940-Jul 1941: Model M-61 (red), Model R-41
•Jan 1941-Jul 1941: Model G-31 (brown)
•Jan 1941-Jun 1951: Model GL-31-P
•Feb 1941-Jul 1941: Model M-61-A (red)
•Mar 1941-Jul 1941: Model K-60A (polished)
•Mar 1941-Jul 1941: Model R-41-P
•Oct 1945-Apr 1947: Model D272
•Jul 1946-Apr 1947: Model M262
•Apr 1947-Jun 1949: Model S246
•Oct 1947-Jan 1949: Model D360
•Sep 1949-Oct 1949: Model R-49
•Oct 1949-Mar 1951: Model S250
•Mar 1950-Sep 1950: Model D360A
•Apr 1951-Jul 1955: Model S250A
•Aug 1955-Feb 1957: Model S255
•Feb 1957-Feb 1958: Model S260