- $25.00 GBP MILITARY - Capt Field's Improved - Parallel ruler - Broad Arrow 13/88 - 1920s?
- $18.00 GBP Vintage 15 inch wood/brass Parallel Rule Maritime Navigators/Surveyors Rule
- $45.00 GBP A Vintage Captain Field's Improved Parallel Rule
- $39.00 GBP H HUGHES & SON PARALLEL RULER Vintage Antique Navigation Rule Ruler Bundle
- $25.00 GBP Capt. Field’s Improved Boxwood & Brass Parallel Map Ruler - 18"