What kind of brake drum?

[hougher]

Thanks for letting me join and welcome from Nanoose Bay on Vancouver Island in British Columbia Canada. I recently purchased a 1930 Model A 5 window coupe that had been converted to hydraulic brakes at some point in its life time. I was able to identify the front drums as 46 - 48 Ford, but have not been able to identify the rear drum (pictured). Any help is appreciated, Thanks.