Dave Sr. from SWISCO responded:
December 1, 2016
I agree, the 39-013 and 39-014 look close. The 39-028 has a similarly shaped base, but your arm is far longer. The shape of the base doesn't matter, yours is just an older version. They don't make these operators with a squared base anymore. As for the bend, I can't make it out from your photo. If it's only a slight bend, I think the 39-013 can still work.
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