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Extremely rare (only a small handfull known to exist)
MHR1 Navigational Instrument by Dennert and Pape (GWR).
This is a small 'handy' version of the HR2 that would
have been used for navigational purposes on a U-boat.
These slide rules give extremely accurate readings similar
to the HR2 and ARG1 instruments.

The original design of this was taken from the early
Bygrave AML Position Line Ruler. This was basically an
updated version. There was also a Luftwaffe version of
this instrument HR1.

Instrument is in fantastic overall condition.
These are very hard instruments to find.