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541
Let me narrow this down to what makes it extremely rare and actually something for the museum:
Jun 21, 2020,01:01 AM
- ref 5500 (Air King case) - not so rare
- ref 5500 with the Explorer dial (but still the 34mm case) - rare and collectible
- ref 5500, Explorer dial and caliber 1530 (Super Precision) - very rare and not something seen every day
- ref 5500, Explorer dial, caliber 1530 and underlined "Super Precision" text - extremely rare
- re 5500, Explorer dial, caliber 1530, underlined text and then add double T<25 - I must admit, I have during my years never seen one before (I have read about it but I thought it was an urban myth that one actually exists