5500.00 Exquisite Antique Engraved 2nd Model Tranter in 38 Bore (.50 Calibre) London Apr 20, 2024 - 10:46 AM BWCanada For sale is a very rare and massive 38 bore (.50 calibre) British 2nd model tranter in exceptional condition. This revolver would have likely been purchased by a gentleman circa the 1850s-early 1860s.