Patent# is the only number on this part.

Hello, thank you for posting,

We are not able to provide an exact match for your original latch, but to further review, are you able to provide written out dimensions of the length and width of the latch excluding the locking tab? From there we can compare to our selection to determine if we can supply a suitable alternative. 

Thank you,

Unfortunately we do not carry a latch with a 2-3/4" length. The closest we carry is a 2-5/8" or 2-7/8". I have related two styles on the page for your review. Also note that neither of these styles have the curved in latch tab like your original. For this reason, we cannot guarantee there will be clearance for the balances in the window channels. 

Please double check dimensions to see what you think! I apologize that we cannot provide an exact replacement option.