Searching for traco window sash lock R27

A quick learner says:
I'm looking for a sash lock with the dimensions:

1/2" wide
2 1/2" long

Patent number 5.138.291. Has R27 on the back.
Profile picture of Bob
Bob from SWISCO responded:

I can't be certain without a picture, and I can't cross-reference those codes to a specific part, but if it's a sash lock, see if our 90-075 matches up. Let me know what you think. 

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