1958 duo glide frame identification

[ernort]

add pici need some help identifying a 1958 duo glide frame, the frame is a step frame, has the 58 on the swing arm,duo glide servi stand, correct rear lights and tin,the motor mount has a 71 stamped, i do not see a A,B,C..8 stamped on the mount,where else can i look to determine the frame year?
any help will be much appreciated.

BTW this is the first time i post, so excuse me if pic does not show.

[Hollywood]

7 is for 57 and I is for the 9th month September. So that would be a 58 production year frame. made in sept 57.

[ernort]

is that the only place the 7I is stamped?
thanks

[Robert Luland]

That's it in a nut shell.

[ernort]

sounds good..i 'preciate your replies..
58 it is..cool