- $18.00 GBP Vintage Capt. Field's Parallel Rule - made for Captain O.M. Watts Ltd london
- $85.00 GBP Vintage Royal Navy BHL Navigation Parallel Rolling Rule Maritime Marine Nautical
- $45.00 GBP Vintage Royal Navy Navigation Parallel Rolling Rule Maritime Marine Nautical
- $45.00 GBP Vintage Royal Navy BHL Navigation Parallel Rolling Rule Maritime Marine Nautical