Post #23 Phnom Penh purchase check up

Once at home I put my Phnom Penh purchase, the Seiko Skyliner on the timegrapher. I think it’s not bad considering that the watch is between 56 to 62 years old. I wasn’t able to open the caseback. I tried with my Seiko “opener” with no success. Would this have to be opened from the front? Can anybody help me?

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