1939-40 Imperial Oil NHL Pocket Schedule Vintage Hockey Sports Calendar1939 40 Imperial Oil NHL Vintage Pocket Schedule Measurements: closed approx 4. 5" x 3" open approx 18" x 3" Excellent condition; minor edgewear throughout, minor corner creasing, general creasing from folding, otherwise no notable creasing or tears, minor stain on the back cover Imperial Oil is a Canadian petroleum company, and supplies Esso brand service stations. From 1934 and onwards (until 1976) Imperial Oil was a sponsor for CBC and Hockey Night