More info here:http://www.meterstampsociety.com/
... The Meter Stamp Society, an APS affiliate, is dedicated to the collection of metered and digital postage stamps. These include topical slogans on postage meter stamps, computer vended postage (CVP), framas, photostamps and similar items.
/s/ ikeyPikey (who grabs & retains attractive ROTW meter imprints from the bargain box ... but does not collect them)