Which iron to use
High-volume hand stamping
Volume comes from stamps per pass. A single iron stamps one pack at a time. A 10-stamp 2x5 iron presses a whole row of ten at once. On a busy bench that is the difference between counting packs and counting rows. The 10-stamp 2x5 is the higher-volume workhorse.
The math follows the pad count. Spread an iron's price across its stamp positions and the cost per position drops as the positions go up. A single iron is one position. A two stamp is two. A 10-stamp 2x5 is ten. A 10-stamp iron does not cost ten times a single iron. It costs about twice as much and stamps ten positions per press. That is where the iron earns itself back.
The 2x5 line runs as a ladder. The Standard 2x5 uses aluminum stamp bars and carries the longest cord on the line, twelve feet. The Deluxe 2x5 swaps in ten individually polished brass pads for smoother, faster transfer. The Deluxe Plus 2x5 adds an illuminated power switch, so the iron stays ready between runs instead of being unplugged, and a 450-degree over-temp cutoff that protects the iron if a thermostat fails.
Recommended irons
What we would reach for

Standard 2x5 10 Stamp Iron
The standard 10-stamp iron in a 2x5 configuration, in wood or black handle.
$665plus S&H

Deluxe 2x5 10 Stamp Iron
The Deluxe 10-stamp 2x5 iron with individually polished brass pads.
$700plus S&H

Deluxe Plus 2x5 10 Stamp Iron
The Deluxe Plus 10-stamp 2x5 iron with power switch and over-temp shutoff.
$999plus S&H