how did the SP mark there tools in the 1920's

Model Railroader Prototype information for the modeler
1

did the SP mark there tools with SPco or SPRR or SPRY ?the reason for asking is i have come into a bemis and call monkey wrench marked SPco looks like its a one piece stamp and the SP had a large roundhouse here .

2

This article does not answer question, but does discuss railroad markings. http://www.railroadiana.org/info/pgMarkings.php The tools you have are very likely Southern Pacific , but does not preclude other markings also being used at various times/places.

List of SP Standard Plan sheets

http://espee.railfan.net/common_standards_drawings_table.html Standard plans for Tools might answer question

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428 1200 Tools ShovelHandles