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- The first meters appear to have been installed in the early 1970s.
- All stamps inscribed “OMAN” or “SULTANATE OF OMAN”.
- 1.1. Neopost “405/505” (MV).
- Horizontal frank with straight, single-line border.
- Country name at bottom center with “BAISA” directly above.
- Frank variable in width, 27-31 mm.
- A: M# at right with “N” prefix at left
- B: M# with “N” at left and “RN” prefix at right
- TM: SC, BIC (date with or without stops centered between day, month, year)
- V/F: 0000 0•000 •0•000
- a: With "BAIZA" instead of "BAISA"
- 1.2. Neopost “205"/"2205” (MV).
- Similar to Type 1.1 but smaller, square frank.
- With “BAISAS” above country name.
- The date figures are either tall (Model 205) or short (Model 2205).
- TM: DC, BIC
- V/F: • 000
- a: Printed in purple
- b. With "BAIZAS" instead of "BAISAS"
- c. With "BAISA" instead of "BAISAS"
- 1.3. Neopost “Electronic” (MV).
- Similar to Type 1.1A but date figures have wide spacing between day, month, and year.
- M# with “N” prefix.
- TM: DC
- V/F: ≋.000
- 2.1. Pitney Bowes-GB “5000” (MV).
- Wide frank with scalloped border and “SULTANATE of OMAN” at top.
- Value figures below level of date figures.
- M# with “P.B.” prefix low between TM and frank.
- TM: DC
- V/F: 0.000
- 2.2. Pitney Bowes-GB “6300” (MV).
- Similar to Type 2.1 but smaller, with country name at bottom.
- Date and value figures on same level.
- With “BAISA” above country name.
- M# with “P.B.” prefix breaks bottom frame line.
- TM: DC
- V/F: 0.000 ≋.000
- a. With "BAIZA" instead of "BAISA"
- 2.3. Pitney Bowes-GB “6900” (MV).
- Large frank with simulated perforation border.
- Country name in Arabic at top and in English at bottom.
- M# with “PB” or “PBE” prefix breaks bottom frame line.
- TM: DC
- V/F: ≋.000
- 2.4. Pitney Bowes-GB “A900”/"B900" (MV).
- Similar to type 2.1 but the value figures are larger, and the date and value figures are on the same level.
- Country name in Arabic at top and in English at bottom.
- M# with “PB” prefix breaks lower left corner of frame.
- TM: DC
- V/F: ≋0.000
- 3. Hasler “Mailmaster” (MV).
- Frank similar to Type 2.3 but not as tall.
- "POSTAGE" is stacked rather than reading up.
- M# with “H” prefix breaks bottom frame line.
- TM: DC
- V/F: 0.000
- 4. Satas "Baby" (MV).
- Small, nearly square frank with scalloped border.
- Country name in Arabic at top and in English at bottom.
- M# with “S” prefix breaks bottom frame line.
- TM: DC
- V/F: 0.000
- 5. Francotyp-Postalia (probably) "EFS3000" (MV).
- Frank similar to Types 2.3 and 3 but taller, nearly square.
- M# with "PU" prefix breaks bottom frame line.
- TM: DC
- V/F: 00000
- 6. Unknown, possibly Francotyp-Postalia (MV).
- Frank similar to Type 5 but with wider spacing and larger date figures.
- M# with "PG" prefix breaks bottom frame line.
- TM: DC
- V/F: 0.000