Beetles - Coca Cola Premiums (unknown manufacturer)

I am posting today some beetles by an unknown, presumably Japanese, manufacturer that were released as premiums in conjunction with Coca Cola. Three mysteries remain: 1) who made them, 2) what year were they released, and 3) how many were there. At the time of this initial writing, I have five. I was hoping posting them would spark recognition by someone.

The figures are small, typical TOOB/tube/gashapon sized. To put things in perspective, the diameter of the base is 3.5 cm. The beetles are single-piece, good quality plastic that can easily removed from the base. The base has the Japanese name on one side and the Coca Cola logo on the other. They are pretty nice in terms of quality and accuracy.

I am pretty sure Kaiyodo did not make them, as they usually mark the base if not the figure itself (but I could be wrong). Takara Tomy and Bandai are possibilities. Any help in identifying the manufacturer would be most appreciated!

The lineup (as of now):

1. Prosopocoilus inclinatus

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2. Dorcus hopei binodulosus

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3. Dorcus rectus

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4. Lucanus maculifemoratus

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5. Allomyrina dichotoma

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Looks like Kaiyodo bottle cup

I tried to search a little but it seems these beetles are not commonly found figures. I am sure google also gave you lots of VW Beetles with Coke log on it. Maybe in a board of Coca-Cola gifts collectors you will be able of finding some information about it. However, once I asked in a forum of collectors of McDonald's gifts about the animal series of 2006 and they didn't know it at all.