General Information:

• This model was painted all "Cloud White," except for the black on the wraparound cowl. 
• The serial numbers was on a plate riveted to the swivel bracket above and between the clamp screws..
• Serial numbers 1421113 thru 1460498 were 1961 models.
• Merc 500's were produced as Merc 500M (Manual Starting, Short Shaft), Merc 500ML (Manual Starting, Long Shaft), Merc 500S (Electric Starting, Short Shaft, without Alternator), Merc 500E (Electric Starting, Short Shaft, with Alternator), and Merc 500EL (Electric Starting, Long Shaft with Alternator), as well as Merc 500SL (Electric Starting, Long Shaft, without Alternator).