Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums General Petroliana Discussion Question for Shell Collectors - Porcelain Sign

I would think it was attached to the top of the holder for the various grease guns used to lube the vehicles back in the day. It held multiple grease guns filled with the appropriate grease for the chassis, water pump, etc. I have seen many in pictures from back in the day in the "Luberitorium".