Rare~1930s Hoffritz Germany Opisometer Map Measure Nautical Compass Instrument

Description

Vintage set of opisometers. The instruments are used to determine (particularly curved and irregular routes) length of course / trip by "rolling" bottom wheel across map or chart. Both appear to be from the same German maker and era ( pre-1940s) . Both are high quality, accurate  professional grade mechanical instruments. Solid chromed non-magnetic metal frame construction. Both are approximately the same size (74 mm long - close to 3") and in excellent lightly used  condition.
The rarer model is generic (no maker signature - unless Wanderer Germany is the brand name) specialized in nautical applications and has adjustable attached "marker" or pencil used marking/ plotting  course on maps. It has a paper dial with 2 toned nautical miles meter (..up to 74 and inches to nautical miles scale setting) on one side and a paper dialed magnetic compass on the other.  Clear acrylic domes protect each side of the opisometer. The the instrument (...as well as the marker) looks unused, has been tested  and appears fully functional. This version is very rare - I haven't seen another example.
The other model - signed Hoffritz Germany includes stitched leather storage pouch. This appears to be more refined with more detailed and better quality dials than the previous "Wanderer" example.   One side of the instrument has centimeters to kilometers scale along with miles to inch scale on dial . Blued steel indicator is set to  indicate scale setting to coincide with maps scale. The opposite side dial displays 3 multi-colored distance recorders (nautical miles, kilometers and statute miles) with blued steel indicator. Slightly yellowed acrylic domes protect both of the instruments dials. The device has been tested and appears fully functional.
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Thanks for looking - Brian