Pitney Bowes Model RF metering machine
In January 1940 Pitney Bowes introduced their model RF omni-denomination meter. It operated on four mailing machines that were designated 6801, RG, RS, and RM. The RF meter machine printed postage in increments of one-half cent up to a maximum of $9.99 and one-half cent, with a postmark and advertisement or slogan. The automated RM machine was able to print, seal, and stack 220 envelopes a minute. This line of machines and meter offered any business, from small to large, the opportunity to own a postage machine.
Levers on top of the machine allow for setting the value or denomination of postage required. The amount is visible in a window below the setting levers and allows confirming the amount before printing. A register on top shows the credit balance in dollars and cents and could be set by the post office for a total amount of $9,999.99 at one time. The register on the side showed the accumulative amount of postage used. When users needed to print amounts over $1, they pressed down a button on the left top rear of the machine. The colored dials on the front set the printing of date, city, and slogan, as desired for general mailings, registered letters, and advertising mail. Each machine could also be fitted with tape for use on packages.