Granted that this post appears somewhat self-aggrandizing (which I suppose it is), but more importantly, its an invitation to check out the new ESPHS website and to consider joining our society if New York State postal history is something you're interested in and/or collect.
This link will take you to my recently-added exhibit, The Marcophilly of Hudson, NY:
A very nice exhibit. Here is an earlier date (April 29, 1910) for the Universal machine cancel on page 146:
I have had fairly good luck in this era finding newspaper articles when a new canceling machine arrived and was put into use in small to medium sized towns, thus documenting the exact EKU findable.
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Posted 05/06/2019 10:34 am
Newly listed items on eBay by docgfd. 
WORCESTER TO NORTH CHESTER MASSACHUSETTS 1914 EMBOSSED BIRTHDAY PPC SCOTT 397
USS GENERAL M RANDALL FLEET PO TO ILLINOIS 1947 ISLAND AND RAINBOW CACHET AP115
BOSTON MASSACHUSETTS TO BABB MONTANA 1947 SCOTT 950 803 BLOCK CINDERELLA
SACRAMENTO CALIFORNIA 1933 BARK WILTON DEDICATION 1ST PO 1849 POSTMASTER SIGNED
KALAMAZOO TO ANN ARBOR MICHIGAN GSE SCOTT U84 BLUE DUPLEX CORNER CARD
