The geared arm is 3 1/2" from center to tip. The clip arm is 4 7/16" The only marking are Truth and patent # 4 241.541 Patent 1982
Casey from SWISCO responded:
November 16, 2020
Thank you for your post. You have an older version of a crank operator that may not be around anymore. However, we may still be able to help. Please take a look at our 39-035 and 39-036 operators and let us know if these could work for you.