From information received, it would seem that Tomei was the contract supplier of the factory oil pans & these did not have the Tomei name on them.
Quite obvoiusly they made their own pans with their brand on them.
It would also seem that they were available in a couple of different capacities as I have seen one with a wider 'batwing'
As for weight, the pressed steel one is considerably lighter than the cast alloy.
This is my unbranded example thanks to 2332owner in Okinawa.


This is the higher capacity example. [below]
