Bockenheim

Bockenheim was built in 1924, making it 102 years old. It is one of 47 hulls in this registry delivered that year, a cohort whose median tonnage is 2,480 GT. Across the whole of the 1920s the registry holds 516 vessels, median 2,350 GT. The median build year across the entire registry is 1995.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 5606248 this registry holds 22 other vessels, whose median build year is 1925 and which range from 1906 to 1928. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1924.

Its IMO number, 5606248, carries its own check digit. The first six digits are weighted seven down to two and summed — 5×7 + 6×6 + 0×5 + 6×4 + 2×3 + 4×2 = 109 — and the last digit of that total, 9, must equal the seventh digit, 8. It does not, so this number as recorded does not validate; it is shown here as held rather than silently corrected.