Marva window operators

A home owner from Vieques, PR says:
We have 10 year old Marva windows. Marva is no longer in business. Attached are several pictures of the window operator. We're looking for 28 total. Thank you for your help.

User submitted photos of a window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Hey, Len. I've seen this operator before, but I'm afraid we cannot supply an exact replacement. We do carry a universal type operator that may work. This kit comes with three different arm sizes, and I'm thinking the smallest arm is what you want. See our 39-346 and let me know what you think.
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