The Ben Hur Rasierklingen Fabrik was started in Solingen Germany in about 1905.
They produced razors under both the Apollo and Ben Hur brands.
Depending on who you believe, their first adjustable razor was produced in approximately 1950. (or Middle 1930's)
The later two versions are more readily available. The better examples demand premium prices.

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Apollo Mikron 1	Apollo Mikron 2	Apollo Mikron 3