The Data III was Pioneer based. The Data Universal and Data II were both modified Philips. The Philips model number was CDV400. They show up cheap on ebay quite often.
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Another option would be to go with one of the universal remotes that has a full database of supported units. For example, the Logitech Harmony series has an extensive db (including Theta, I'm not sure about the Data or Philips likely). I just bought one and have just begun to play around with it, nice ergonomics.