United States Postage Meter Stamp Catalog/GROUP OA – Official Armed Forces government business mail franks/Sub-group OA-ARM: Stamps used primarily for Army official business

Sub-group AR-ARM: Official Mail meter stamps used primarily for Army official business

 * Some of these stamps are quite elusive but their actual rarity is not known.

Type OO-IE1, OO-A4 in 2001 edition

'''OA-ARM1. "6500" series'''.
 * Corresponds to Types IE1, OO-A4.
 * As previous OO-A types but the value box is much wider than tall.
 * A. Wavy lines at left in value figures, 2mm tall ( ≋ )
 * B. Smaller wavy lines at left in value figures, 1mm tall ( ≋ ) (2310000 and 6090000 series)
 * C. The lines of the value box are thicker than the town mark circle line. (2310000 and 6090000 series) MeterCat 5 spaces.jpg[RR]
 * Meter numbers: 2310000, 6000000, and 6250000 series
 * V/F: MeterCat 5 spaces.jpg ≋ 0 .00 ≋ MeterCat 5 spaces.jpg (range: MeterCat 5 spaces.jpg.001 to 99.999)


 * a. Town mark with U.S. ARMY  at top,  APO  and 5-digit number at bottom