Nothing in this subsection shall be construed as denying the right of the board to renew or to transfer existing distributors' or importing distributors' licenses or to exchange a distributor's license for an importing distributor's license or to exchange an importing distributor's license for a distributor's license, upon adjustment of the applicable fee, notwithstanding that the number of such licensed places in the county shall exceed the limitation hereinbefore prescribed: Provided, That no distributor's license or importing distributor's license shall be transferred from one county to another county so long as the quota is filled in the county to which the license is proposed to be transferred.
47 P.S. § 4-437