Please help me with my philatelic education!

I’ve been primarily a collector of Japan for 20+ years, but have been wanting to get more familiar with US stamps.

I’ve acquired 16 US postcards from the early 1900s (1907-1920) that have RPO (railroad post office) cancels.

I’m hoping someone has the right reference materials to help determine:

  • the Towle catalog number, if possible (that’s the right catalog, right?)
  • the relative scarcity or desirability of the cancels
  • the RPO route (in a few cases where the postmark is not clear)
  • the Scott number of the stamp

Each card, presented in alphabetical order, has its own post, in case that helps focus the discussion. There’s a link to comment below the title, just above the horizontal line that separates the body of the post from the header.

A detailed scan of the postmark and cancel follows after each card. (You can click on any card to see a larger view in a new tab or window.)

I imagine that everything is all common material, but I would appreciate learning more about it.

My source for the stamp identifications is the fantastic site 1847USA, especially their Washington Franklins worksheet, plus a little guidance from the Scott 2007 US Specialized.

Many thanks in advance for any and all assistance!

– Dave Frick (APS 187980)

Ashland & Gerber RPO
May 14, 1918
Train 15

  • Towle catalog #?
  • scarcity?
  • Hard to watermark on cover.  Scott 425: most common? or Scott 463: most contemporaneous?  Single from booklet pane?

Baltimore streetcar: Roland Park & Highlandtown RPO
Dec 6, 1918
Train 2?

  • Towle catalog #?
  • scarcity?
  • type of machine cancel?
  • Does the “2″ in the stripes of the cancel indicate Train 2, or just something to do with the cancel?
  • Scott 499? (stamp is perf 10.9 x 11; frame is 19 x 22 mm; hard to check for watermark on cover)

Chamberlain & Rapid City RPO
Feb 16, 1912
Train 4

  • Towle catalog #?
  • scarcity?
  • Scott 374  (unable to watermark; most contemporaneous cancel)

Chariton & St. __?__ RPO
Mar 29, 1907
Train 113

  • St. __?__ ?
  • Towle catalog #?
  • scarcity?
  • Scott 300

Kansas City & Joplin RPO
Nov 15, 1910
Train 210

  • Towle catalog #?
  • scarcity?
  • Scott 331

Miles City & Spokane RPO
Aug 24, 1913
Train 4

  • Towle catalog #?
  • scarcity?
  • does “W.D.” stand for “Western District”?
  • Scott 405

Monett & Paris RPO
Mar 23, 1908
Train 2?

  • Towle catalog #?
  • scarcity?
  • There is a digit, a 2(?), on a separate line between the day and the year. Would that be the train #?
  • Scott 300; booklet pane single?

Pocatello & _??_ RPO
Feb 6, 1920
Train 84

  • Pocatello & <what?>?
  • Towle catalog #?
  • scarcity?
  • Scott 498? (stamp is perf 11 x 11; frame is 19 x 22 mm)
  • Also, could the stamp be from a booklet pane, or is it just from the right edge of a full pane?

Reliance __?__ MBO
Dec __?, 1911
Cuba destination

  • Reliance ___?
  • MBO?
  • catalog #?
  • which catalog?
  • scarcity?
  • Scott 374? (perf 11.9 x 12; most contemporaneous usage)

__?__ & San Francisco RPO
Jul 7, 1911
Train 2(?)

  • __?__ & San Francisco?
  • Towle catalog #?
  • scarcity?
  • Train 2?
  • Scott 374? (perf 11.9 x 11.9; most contemporaneous usage)

Spokane & Lewiston RPO
Dec 20, 1911
Train 23(?)4

  • Towle catalog #?
  • scarcity?
  • Train 234?, 284?
  • Scott 374? (perf 12 x 12; most contemporaneous usage)

Spokane-Pasco SFAT RPO
Feb 7, 1912
Train 4

  • Towle catalog #?
  • scarcity?
  • S.F.A.T.: Santa Fe, Atchison Topeka?
  • Scott 374a? (perf 11.9 x 12; most contemporaneous usage)

St. Vincent & St. Paul RPO
Jan 1, 1913
Train 192

  • Towle catalog #?
  • scarcity?
  • Scott 405

Temple & San A__?__ RPO
Aug 14, 1907
Train 75

  • Towle catalog #?
  • scarcity?
  • Scott 300

Tuolumne & Stockton RPO
Dec 21, 1908
West

  • Towle catalog #?
  • scarcity?
  • “West”-bound train?
  • Scott 300

Tuolumne & Stockton RPO
Apr 14?, 1911
West

  • Towle catalog #?
  • scarcity?
  • likely Scott 374 (hard to check for watermark; 374 is most contemporaneous and most common)
  • “West”-bound train?
  • reasoning for date: “4″ is legible, but preceding digit is not; however, the postcard is an Easter card, and Easter was on April 16 in 1911