Are you in a SM? Hull number? Always helpful.

If a SM. indeed the key blanks can be hard to locate. The big box hardware stores do not carry them. I have had luck in two separate old-time, rusty and musty hardware stores that recognized the blanks immediately. Or you could try a locksmith. The smaller hardware stores and locksmiths, even if they don’t have the blanks, might special order them for you, albeit for a little more money. I would still think a better option than a new lock.

Tom Peacock

SM 240 Aletes