Question about Roth basses

I recently got a very good deal on carved 1960 Ernst Heinrich Roth bass that original owner had been stroring for over forty years. It's in great shape and the "EHR" shield logo on the back of the bass is my current avatar.

I know these were factory made basses that were imported by the US based Sherl & Roth company (The bass came with a letter from Heinrich Roth dated November 1960). My question is whether these basses were actually made in the Roth shop or were they more than likely made by another German company for them to sell under their E.H. Roth name.

- Steve