"Mercury produced (or deve
"Mercury produced (or developed if you like) 4 differnt "Thunderbolt" ignitions. Type 1 and 2 still had points, type 3 did away with the points and type 4 (or the current version which is what most people "mean" when they say thunderbolt) has individual coils per cylinder. The magneto in the type 1 was a major innovation at the time and allowed for longevity of the system without service or adjustment. So yes it's a thunderbolt, just not the one most people "mean". Model 200 Merc built in 69 (and earlier) had type 1, They switched to type 2 for the 70 - 72 model years and thereafter all had type 4 ignitions.."