Tottoko Hamutaro Anime Dechu! is a direct-to-VHS OVA released on September 15, 1999. This was the first attempt at an animated adaptation of Hamtaro, and consists of four short episodes.
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The VHS was only released as a mail-order from the September 1999 issue of Shogakukan, and given away for free to Shogakukan staff with preschool children.

(Source: Hamtaro Wikia)