A Johnson outboard engine, model number RDE19M, would be a 1957 year model, 35 hp outboard.
About 135 lbs. The long shaft weighs 139 lbs.
It is a 1957
50 to 1 oil to gas
JW-13 motors are all made in 1957
The 1957 model, 18 hp Johnson outboard, requires an Champion J4C, or NGK B8S, gapped to .030 in.
1957
The fuel mix is 24:1
A 1957 Evinrude 18 hp weighs 85 pounds, so I would assume the Johnson 18 hp would be about the same, give or take a few pounds.
1957 5 hp 4000 rpm
I just recently purchased a 1957 Evinrude Fleetwin in Burlington Ontario for 200.00 It needs tuning but is in good condition
I would guess that this engine in mint condition would be worth at least $500.