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Hi Jamie,

Though some of us used to call it the CH751 key, that was actually the key blank number!

I have an extra key or two. I've got a "Motorola Outdoor Cabinet" in my garage that uses that key. I imagine the 2553 may well be the correct moniker (and my key lock box legend chart appears to corroborate that) but mine don't say that on them.

I have what was known as the "Motorola Silver Book" which was a late 1970's hardbound parts book and it has the keys/part numbers, etc. listed. Unfortunately, it's packed away at the moment.

I ran into a modern industrial lock/key application of that exact key cut on NOVA transit buses. My job that I just retired from, after 25 years owning a Motorola dealership, was maintaining our city's buses comm and?electronic systems.

If you need me to send it to you let me know and provide an address.

73, Aloha,

Kimo Chun KH7U