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Dm18a1

The Dm18A1 I have in my hand is 555mm long and 90mm diam. (top ring max diameter). Body diam. where are markings 80mm, sleeve 30mm, base 43mm.
I check also Dm18, same measurments

I don't know the difference between Dm18 and Dm18A1, I only saw an external difference : two grooves on Dm18 base, only one on Dm18A1

Picture (sorry maybe not exactly same scale because made with paint).

dm18.jpg
 
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Here the difference between the DM 18 and DM18A1 - its the parts in the tail section
Difference between DM18 DM18A1.jpg
 
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