I have just looked through my Ford tool collection & found this tool [but not quite!]
Mine has the punched hex below the spark plug wrench end & the head nut hex at opposite end. # 17017 is Ford part number for these wrenches from Model A into '30s up to early '40's. Mine is also marked 20E same as yours which gives us another clue. Mine is British [sorry, not Canadian] commercial wrench, & has the Snail Brand logo. It is based on the Model TT wrench but slightly smaller ; the spark plug opening width is 21mm. An American one would be wider. You are in Argentina which during the '30's, was receiving vehicles from Ford Britain, maybe more popular than the US ones. Your one is a variation on the std. #17017 tool & now looks never to have had the centre hex punched & the opposite end is probably correct as well, but I can not tell what the application is because not well pictured. Hope this helps. Cheers -Tom.