Markings inside. Pat D-193202 with an upside down U . S
RD. 1963 CAN or OAN. You can see the inside in 1 of the pictures
Also you will stamped with an H
Kind Regards,
David
Casey from SWISCO responded:
October 5, 2022
Hello,
I would recommend starting by comparing the dimensions of the 39-258 and 39-259 VE Andersen operators to your assembly. Take a look and if you notice any discrepancies, please let us know your exact dimensions and we can go from there. Thank you!