looking for casement window operator and handle for multiple windows

A home owner from Denver says:
Have multiple casement windows with stripped operator / handle. The stamp inside the window panes is 'Security Window Co.' from 1976. On the upper operating arm the number 30146
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Emily from SWISCO responded:

Hello there!

Thank you for reaching out to us! Is this a front mount operator? If it is, I recommend you start by taking a look at the list of operators we've related for you on this page. Carefully review the specifications and see how they match up with yours. For a new handle, see the 39-114L.

However, please let me know if this happens to be a rear mount operator and we can work from there. 

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