Manufacturers often stamp the their name on the lock itself. Sometimes the manufacturer will stamp their name on the bracket on the door where the latch comes out of the door or the door jam bracket itself i.e., where the latch from the door goes into frame around the door.
Also, you can take your key to your local home center and insert it into the name brand locks like KWIKSET or Schlage. If the key will go into that brand then at least the lock uses that particular brand of cylinder. You then could order that particular brand of rekey kit which should work.
A Schlage key cylinder is used in Baldwin, Emtek, Pegasus and other locks; therefore, our Schlage rekey kit will work on these locks.
A Kwikset key cylinder is used in Ace, Atlas, E-Z Set, Defiant, Duraset, and many other brand of locks; therefore our Kwikset or our Duraset, Ace, Atlas & Defiant rekey kit will work. Look at the entrance handle and if it has a hole in it then use the Duraset, Ace, Atlas, & Defiant rekey kit. If no hole then use the Kwikset rekey kit.