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BMW 503 - Wikipedia
BMW 503 Market - CLASSIC.COM
BMW 503 for sale - Classic Driver
Classic BMW 503 For Sale - Hemmings
503: When ’50s BMW Needed a Car for the Masses but Built
1958 BMW 503 | The Online Automotive Marketplace
1957 BMW 503 Coupe - Bring a Trailer
BMW 503 – The Car That Nearly Bankrupted BMW - Silodrome
Editor's Choice: 1957 BMW 503 | Classic Driver Magazine
Legends both - the BMW 503 and 507. - bmwgroup-classic.com