Help/Info requested re this "stamp"

[ValKehl]

Sometime back in the 1990's when I was picking up all sorts of oddball items for my type collection, I acquired this item which was identified as being a "1938 Signal Oil Stamp." I don't see these listed in the Standard Catalog of Vintage Baseball Cards, nor am I able to find any info via a Google search. This example, which appears to be hand-cut, is about 1.625" X 2.375", is on very thin stock, and has a somewhat glossy surface; the back appears to have an adhesive like that found on a postal stamp. Bill Raimondi, the subject of this "stamp," played for the Oakland Oaks of the PCL from 1932 - 1949. Thanks in advance to anyone who confirms this "stamp" is from 1938 and/or provides more info, such as how they were distributed and/or where to find a checklist of subjects.
Val

[Cozumeleno]

Hi Val - I think you'll have more luck finding info on them by searching 1938 Signal Gasoline Oaks set or the Oakland Oaks stamps set. That seems to be a more common name for them, even though the company's name had changed by that point.

I have a little bit of info on the set on my site but not a ton. Here's a checklist.

Joe Abreu
Pat Ambrose
Al Browne
Bill Conroy
Jerry Donovan
Ken Douglas
Bob Gibson
Jesse Hill
Delbert Holmes
Bob Joyce
Hugh Luby
Harry Martinez
Wilcy Moore
Floyd Newkirk
Floyd Olds
Bill Raimondi
Ken Sheehan
Hollis Thurston
George Turbeville
Laurie Vinci
Frank Volpi
Jackie Warner
Ed Yount
Dutch Zwilling

[ValKehl]

Anson, many thanks for all this info. I don't know why I didn't think to check either your website or the OC website - brain freeze, I guess.
Best,
Val

[Cozumeleno]

No problem, Val - just wanted to weigh in since when I searched Signal Oil as you did, I didn't see much out there, either. Nice card.