A quick learner from Los Angeles says:
August 5, 2016
I have a client who has double hung windows. The lock/latch is missing from some of their windows. I will need to order 5 new ones. Can you please help me identify the part/part number so I can get some new ones ordered and installed ?
Dave from SWISCO responded:
August 9, 2016
Thank you for contacting us. I think we can help, yes. Please see our 90-261 lock, this appears to match what you have. I would just make sure the measurements are the same. Let me know what you think.