Replacement sash lock

A quick learner from Middletown, CT says:
Looking for replacement lock for window. Measures 2.375" wide, 1" deep and 15/16ths tall from top of knob to bottom of lock. Unsure of brand of windows, but the are original windows of house that's 28 yrs old. Lock has the alpha/numeric A-S PA. and 9778 on it.
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Emily from SWISCO responded:

Hello!

I'm afraid we don't have an exact match for the lock pictured here but our 90-281 and 90-298 are similar. I can't guarantee either will work but look over the specifications and compare them with yours to see what you think. 

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