Envelope with advertising on both side, for two Standard Oil products, vapor stoves and Mica axle grease.
For Comfort and Economy use Vapor Stoves
Printed return address Standard Oil Company Dayton OH
Postmarked pm front DAYTON OHIO JUL 13 ’99 and on back DAYTON OHIO JUL 14 1899’
Envelope is still sealed, no contents.
Some smudges on front.