The below is from their Houdini holdings and might seem innocuous at first. I don't even think this is Houdini's handwriting. But the date tells us this is something very special.
This appears to be a tag that accompanied flowers or some other gift from Houdini to Bess on their Silver Anniversary on June 22, 1919. The Houdinis celebrated the day with a gala dinner at the Hotel Alexandra in Los Angeles. The hotel and ballroom still exist. I had a visit in 2019.
Here's wishing Harry and Bess a happy 128th. I'm not sure what metal that would be, but it would need to be a rare one!