Can you tell what this is?

[Drb007]

My dad got this with a rotted old Dunphy yesterday. Fortunately, it was stored indoors, unlike the poor boat.
It is very clean, and we are told that it runs very well. I will try to get more information, but had limited access to it yesterday.
We are told it is a 50hp that was built up to 57hp?

 

[jbcurt00]

• This model was painted all "Cloud White." In addition, Custom Deluxe E & EL models were produced with chrome or stainless steel bands just above and below the wraparound cowl. These were available in all "Cloud White," "Holiday Red" & "Cloud White," and "Bimini Blue" & "Cloud White."
• Model & serial numbers were on the instruction plate riveted to the swivel bracket above and between the clamp screws..
• Serial numbers 1195070 thru 1286084 were 1959 models.
• Mark 58A's were produced as Mark 58AM (Manual Starting, Short Shaft), Mark 58AML (Manual Starting, Long Shaft), Mark 58AS (Electric Starting, Short Shaft, without Alternator), Mark 58AE (Electric Starting, Short Shaft, with Alternator), and Mark 58AEL (Electric Starting, Long Shaft with Alternator).
• It is not clear whether any Mark 58ASL (Electric Starting, Long Shaft, without Alternator) models were produced.

Super Thunderbolt​

45hp​

Ser# 1195070 thru 1286084​

1959​

 

[Chinewalker]

Solid motors! Always liked the 4-cylinder Mercs of that era. Not hard to work on once you learn a few of their quirks. HIGHLY recommend getting the 1965 and prior Merecury service manual if you plan on keeping it.