MANY thanks to Lance Williams of Williams Stationery Company, Camden, New York, USA for providing this video.
It shows their in-house manufactured 2-up modifications for a 10X15 Chandler and Price Craftsman with Rice Feeder.
The press is filmed producing #2 Stamp Glassine Envelopes (2-5/8" x 3-5/16"), running at about 3,000 impression per hour.
With stock replenishment (500 envelopes per stack at a time), a throughput of about 5,750 envelopes an hour is achieved when running larger quantities of a given copy.
Lance says: "We run anything from 25 to 10,000 envelopes of a given copy. The current job running was 10,000 envelopes. We run these envelopes and 3 other sizes about 3-4 days a week, 2-2.5 million envelopes a year.