Window manufacturer
I would like to sincerely apologize for the wait. For whatever reason, your original inquiry did not show up in our list of open inquiries. I believe it may have been a system error. Either way, I'm very sorry for any inconvenience the wait might have caused.
Reviewing your inquiry, you will need to check the inside frame for a certification AAMA sticker. These sometimes, but not always, give a clue as to who made the window. If you show me that sticker, I can tell you if it does contain such a clue.
Otherwise, your best bet is to contact a local professional who is familiar with homes in your area. They may have worked on this window before from a neighbor's house and can point you in the right direction.