The long shifter seems like it is on most every 2520/4020 made in 71/72.The 4320 were all long.As to A&I front I had a couple that said made in Canada and the center section was visibly larger on the bottom which to me would be better but to some not original.It is kinda funny how some brands the first of the series is hot and New Gen the last ones are most desirable.The first one made is sought after by the Keller Family but after that there isnt that much difference.There seem to very few over 270000.I have only seen two but there are 288 numbers over 270000 used for 4000s&4020s but some numbers are not used.I have not figured why.
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