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An advertisement I've found appears to backdate the release of the Model 1 by a couple of months:
June 8th, 1955 - Richmond and Windsor Gazette
Hello bestseller

That is great additional information. I may be able to add something here.
The earliest record I can find referencing the 'new' Rotomos is from
13 April, and then 20 April. These articles indicate that the Rotomo
was pending ... available soon.

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Release: well, Penrith had them in mid May.
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My best guess is that the first Model 1s became available in May of 1955.
As more records become available, this may be brought back to April.

All very chronological.
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Jack