I have a large (2″ × 3″) brass Segal pin tumbler that came without a key. I love this lock and plan to keep it. It was a personal milestone as I SPP’d it for the first time a month ago. Anyway, I’d like to get a key for it. It has something stamped on the cylinder but I’m not sure it is a key code. I took it in to the local locksmith. They tried to look it up in their software but came up empty. It is an all-letter code but looks to me as if it code be a key code. Take a look, it reads “BFBBD”:

So is this 26224? (i.e. A=1, B=2, etc.) Seems too obvious. A direct substitution cypher isn’t exactly secure. Could it be a standard ’look-up" code - i.e. look it up in the book and find the cuts are 15623 Do any of you have a Segal with similar (all letter) codes?