Here is an antique cocktail strainer that marked “Pat. Aug. 16, 1904”. It measures approximately 5 and 1/4 inches in length and approximately 3 inches wide.
This design was patented by Frank H. Vogt and the patent was assigned to Charles J. Hauck who was a manufacturer of fancy metal goods at his Brooklyn, N.Y. location. The patent can be viewed at my blog post http://queenofsienna.wordpress.com/2014/06/21/some-turn-of-the-century-cocktail-strainer-patents/
Although this patent was assigned to Charles J. Hauck & Son, I do not see their mark on this strainer, only the patent date.
have written a blog post about C. J. Hauck, including patent illustrations, which can be found here:
You might also like to read my blog post “The Victorian Bar” to read more about julep strainers:
Theis strainer does not appear to have been plated and it is not magnetic. It could be brass, an alloy or a white metal. It has a dark patina.
If you are interested, this strainer can be found here at my Etsy shop: https://www.etsy.com/listing/253563577/frank-h-vogt-antique-cocktail-strainer