Doxa Multi Scale Steel Spillman Case ChronographThe blue snail scale This is an early and very rare large size waterproof steel chronograph from the 1940s 38. 5mm was huge at that time. These early Doxa chronos are very collectible due to the beautiful steel waterproof cases, in this instance made by Spillman who were one of the leading makers of waterproof cases of this era. The case on this example is strong all round with great definition on the angled lugs. The watch houses a multiscale dial