Antique Thornton & Minor Sanitarium‎ Birthday Greetings Sand Timer 3 Minute 1905

Please see pics for condition. Sand timer advertisement. It says time your telephone and eggs 3 minutes Birthday greetings from the Thornton & Minor Sanitarium Kansas City MO. I believe there was text on the bottom but you can no longer see it. This is from the early 1900s, I think 1905. Timer still works. This sand timer displays significant wear consistent with its early 1900s age, showing heavy surface oxidation and patina throughout the metal backing with areas of text becoming faded but still readable.  Features  * Functional 3-minute sand timer with pink sand * Thornton & Minor Sanitarium promotional advertisement * Kansas City Missouri medical facility memorabilia * Birthday greetings message from sanitarium * Instructions to time telephone calls and eggs * Glass tube timer mechanism in working condition * Metal backing with circular top design * Measures 9 inches tall * Decade: 1900s