No. Stamps without a currency indicator, i.e. stamps with the denomination in Finnish mark, are no longer valid as postage. Åland stamps currently valid as postage are:

• Stamps with dual currency indicator, i.e. mk and €
• Stamps with the currency indicator €
• Stamps denominated 1 klass (1st cl), 2 klass (2nd cl) and Julpost (Christmas postage)
• Stamps denominated Lokalpost (local), Inrikes (domestic), Europa and Världen (worldwide)