Here is a silver plated vintage roll over (a/k/a bottoms up, tipping) style jigger marked “Patent 115831” with a “17” below it and “2 OZ” on the bottom. There is no maker’s mark. Also included is the original box and directions.
This Patent No. 115831 for ” Measuring Container”, dated July 25, 1939, was obtained by H. B. Kaempf. I believe this was the first patent issued for this style of jigger. This type jigger was offered and advertised as “Host” and “Hostess” jiggers with the “Hostess” jigger holding 1 ounce (offered in silverplate) and the “Host” holding 1 and 1/2 ounces ( offered in either sterling or silverplate). The box and accompanying paperwork call this larger 2 ounce jigger the “Master Host”. I don’t know who actually manufactured these jiggers. I think Kaempf retailed it.
It measures approximately 5 and 7/8 inches across including handles. It is heavy in weight.
The November 1939 Jewelers’ Circular had an ad stating “H. B. Kaempf Co., New York, has just introduced a new jigger type measure called the Host and Hostess….they eliminate spilling, and the possibility of staining your table top.”
This jigger is available here at my Etsy shop: https://www.etsy.com/listing/635030231/roll-over-master-host-jigger-kaempf