BMW Dealer Nos

[desgarland]

Hi folks, not sure of anyone can help me. I bought a 650i several years ago with partial service history and there was a stamp at 51949 for an oil, brakes and brake fluid change done by dealer No 10426 but no dealership details.
Think this might be a bogus BMW dealer stamp but has anyone here got this dealer no on any of their service history books and could advise who the dealer might be?
Many thanks !