Just acquired a few more of these which are on the way. Can find zero documentation. I now have 27 of the 40 (according to the back of the cards). Have always found these in either Australia or New Zealand, so guessing either may be the origin of the cards.
Have both volumes of the "Australian & New Zealand Index" and if these are listed, I cannot find them.
Cards measure 28 x 60 mm.
The cards that I have show racing cars, airplanes, boats, and a very large petrol storage tank!
I have pictured the back of card 12 and the front of card 13.
Would like to know: (1) Company producing cards, (2) date of production, and (3) a checklist would be nice; I may not live long enough to complete, as I have only 27 of the 40 and looking for about 30 years!
All the cards I have are black and white. Based on information on card backs I have, GUESSING 1931 for the date.